diff --git a/builds/msvc/vs2010/libsodium/libsodium.vcxproj b/builds/msvc/vs2010/libsodium/libsodium.vcxproj
index 64fc7af2..122b5330 100644
--- a/builds/msvc/vs2010/libsodium/libsodium.vcxproj
+++ b/builds/msvc/vs2010/libsodium/libsodium.vcxproj
@@ -88,6 +88,7 @@
     <ClCompile Include="..\..\..\..\src\libsodium\crypto_box\crypto_box_easy.c" />
     <ClCompile Include="..\..\..\..\src\libsodium\crypto_box\crypto_box_seal.c" />
     <ClCompile Include="..\..\..\..\src\libsodium\crypto_box\curve25519xchacha20poly1305\box_curve25519xchacha20poly1305.c" />
+    <ClCompile Include="..\..\..\..\src\libsodium\crypto_box\curve25519xchacha20poly1305\box_seal_curve25519xchacha20poly1305.c" />
     <ClCompile Include="..\..\..\..\src\libsodium\crypto_box\curve25519xsalsa20poly1305\box_curve25519xsalsa20poly1305.c" />
     <ClCompile Include="..\..\..\..\src\libsodium\crypto_core\curve25519\ref10\curve25519_ref10.c" />
     <ClCompile Include="..\..\..\..\src\libsodium\crypto_core\hchacha20\core_hchacha20.c" />
diff --git a/builds/msvc/vs2010/libsodium/libsodium.vcxproj.filters b/builds/msvc/vs2010/libsodium/libsodium.vcxproj.filters
index 5fb9bfcf..99cfa569 100644
--- a/builds/msvc/vs2010/libsodium/libsodium.vcxproj.filters
+++ b/builds/msvc/vs2010/libsodium/libsodium.vcxproj.filters
@@ -54,6 +54,9 @@
     <ClCompile Include="..\..\..\..\src\libsodium\crypto_box\curve25519xchacha20poly1305\box_curve25519xchacha20poly1305.c">
       <Filter>crypto_box\curve25519xchacha20poly1305</Filter>
     </ClCompile>
+    <ClCompile Include="..\..\..\..\src\libsodium\crypto_box\curve25519xchacha20poly1305\box_seal_curve25519xchacha20poly1305.c">
+      <Filter>crypto_box\curve25519xchacha20poly1305</Filter>
+    </ClCompile>
     <ClCompile Include="..\..\..\..\src\libsodium\crypto_box\curve25519xsalsa20poly1305\box_curve25519xsalsa20poly1305.c">
       <Filter>crypto_box\curve25519xsalsa20poly1305</Filter>
     </ClCompile>
diff --git a/builds/msvc/vs2012/libsodium/libsodium.vcxproj b/builds/msvc/vs2012/libsodium/libsodium.vcxproj
index 7dd73e58..2430855f 100644
--- a/builds/msvc/vs2012/libsodium/libsodium.vcxproj
+++ b/builds/msvc/vs2012/libsodium/libsodium.vcxproj
@@ -88,6 +88,7 @@
     <ClCompile Include="..\..\..\..\src\libsodium\crypto_box\crypto_box_easy.c" />
     <ClCompile Include="..\..\..\..\src\libsodium\crypto_box\crypto_box_seal.c" />
     <ClCompile Include="..\..\..\..\src\libsodium\crypto_box\curve25519xchacha20poly1305\box_curve25519xchacha20poly1305.c" />
+    <ClCompile Include="..\..\..\..\src\libsodium\crypto_box\curve25519xchacha20poly1305\box_seal_curve25519xchacha20poly1305.c" />
     <ClCompile Include="..\..\..\..\src\libsodium\crypto_box\curve25519xsalsa20poly1305\box_curve25519xsalsa20poly1305.c" />
     <ClCompile Include="..\..\..\..\src\libsodium\crypto_core\curve25519\ref10\curve25519_ref10.c" />
     <ClCompile Include="..\..\..\..\src\libsodium\crypto_core\hchacha20\core_hchacha20.c" />
diff --git a/builds/msvc/vs2012/libsodium/libsodium.vcxproj.filters b/builds/msvc/vs2012/libsodium/libsodium.vcxproj.filters
index 5fb9bfcf..99cfa569 100644
--- a/builds/msvc/vs2012/libsodium/libsodium.vcxproj.filters
+++ b/builds/msvc/vs2012/libsodium/libsodium.vcxproj.filters
@@ -54,6 +54,9 @@
     <ClCompile Include="..\..\..\..\src\libsodium\crypto_box\curve25519xchacha20poly1305\box_curve25519xchacha20poly1305.c">
       <Filter>crypto_box\curve25519xchacha20poly1305</Filter>
     </ClCompile>
+    <ClCompile Include="..\..\..\..\src\libsodium\crypto_box\curve25519xchacha20poly1305\box_seal_curve25519xchacha20poly1305.c">
+      <Filter>crypto_box\curve25519xchacha20poly1305</Filter>
+    </ClCompile>
     <ClCompile Include="..\..\..\..\src\libsodium\crypto_box\curve25519xsalsa20poly1305\box_curve25519xsalsa20poly1305.c">
       <Filter>crypto_box\curve25519xsalsa20poly1305</Filter>
     </ClCompile>
diff --git a/builds/msvc/vs2013/libsodium/libsodium.vcxproj b/builds/msvc/vs2013/libsodium/libsodium.vcxproj
index 2d491728..d4fa9fb2 100644
--- a/builds/msvc/vs2013/libsodium/libsodium.vcxproj
+++ b/builds/msvc/vs2013/libsodium/libsodium.vcxproj
@@ -88,6 +88,7 @@
     <ClCompile Include="..\..\..\..\src\libsodium\crypto_box\crypto_box_easy.c" />
     <ClCompile Include="..\..\..\..\src\libsodium\crypto_box\crypto_box_seal.c" />
     <ClCompile Include="..\..\..\..\src\libsodium\crypto_box\curve25519xchacha20poly1305\box_curve25519xchacha20poly1305.c" />
+    <ClCompile Include="..\..\..\..\src\libsodium\crypto_box\curve25519xchacha20poly1305\box_seal_curve25519xchacha20poly1305.c" />
     <ClCompile Include="..\..\..\..\src\libsodium\crypto_box\curve25519xsalsa20poly1305\box_curve25519xsalsa20poly1305.c" />
     <ClCompile Include="..\..\..\..\src\libsodium\crypto_core\curve25519\ref10\curve25519_ref10.c" />
     <ClCompile Include="..\..\..\..\src\libsodium\crypto_core\hchacha20\core_hchacha20.c" />
diff --git a/builds/msvc/vs2013/libsodium/libsodium.vcxproj.filters b/builds/msvc/vs2013/libsodium/libsodium.vcxproj.filters
index 5fb9bfcf..99cfa569 100644
--- a/builds/msvc/vs2013/libsodium/libsodium.vcxproj.filters
+++ b/builds/msvc/vs2013/libsodium/libsodium.vcxproj.filters
@@ -54,6 +54,9 @@
     <ClCompile Include="..\..\..\..\src\libsodium\crypto_box\curve25519xchacha20poly1305\box_curve25519xchacha20poly1305.c">
       <Filter>crypto_box\curve25519xchacha20poly1305</Filter>
     </ClCompile>
+    <ClCompile Include="..\..\..\..\src\libsodium\crypto_box\curve25519xchacha20poly1305\box_seal_curve25519xchacha20poly1305.c">
+      <Filter>crypto_box\curve25519xchacha20poly1305</Filter>
+    </ClCompile>
     <ClCompile Include="..\..\..\..\src\libsodium\crypto_box\curve25519xsalsa20poly1305\box_curve25519xsalsa20poly1305.c">
       <Filter>crypto_box\curve25519xsalsa20poly1305</Filter>
     </ClCompile>
diff --git a/builds/msvc/vs2015/libsodium/libsodium.vcxproj b/builds/msvc/vs2015/libsodium/libsodium.vcxproj
index 0aa7723e..87379646 100644
--- a/builds/msvc/vs2015/libsodium/libsodium.vcxproj
+++ b/builds/msvc/vs2015/libsodium/libsodium.vcxproj
@@ -88,6 +88,7 @@
     <ClCompile Include="..\..\..\..\src\libsodium\crypto_box\crypto_box_easy.c" />
     <ClCompile Include="..\..\..\..\src\libsodium\crypto_box\crypto_box_seal.c" />
     <ClCompile Include="..\..\..\..\src\libsodium\crypto_box\curve25519xchacha20poly1305\box_curve25519xchacha20poly1305.c" />
+    <ClCompile Include="..\..\..\..\src\libsodium\crypto_box\curve25519xchacha20poly1305\box_seal_curve25519xchacha20poly1305.c" />
     <ClCompile Include="..\..\..\..\src\libsodium\crypto_box\curve25519xsalsa20poly1305\box_curve25519xsalsa20poly1305.c" />
     <ClCompile Include="..\..\..\..\src\libsodium\crypto_core\curve25519\ref10\curve25519_ref10.c" />
     <ClCompile Include="..\..\..\..\src\libsodium\crypto_core\hchacha20\core_hchacha20.c" />
diff --git a/builds/msvc/vs2015/libsodium/libsodium.vcxproj.filters b/builds/msvc/vs2015/libsodium/libsodium.vcxproj.filters
index 5fb9bfcf..99cfa569 100644
--- a/builds/msvc/vs2015/libsodium/libsodium.vcxproj.filters
+++ b/builds/msvc/vs2015/libsodium/libsodium.vcxproj.filters
@@ -54,6 +54,9 @@
     <ClCompile Include="..\..\..\..\src\libsodium\crypto_box\curve25519xchacha20poly1305\box_curve25519xchacha20poly1305.c">
       <Filter>crypto_box\curve25519xchacha20poly1305</Filter>
     </ClCompile>
+    <ClCompile Include="..\..\..\..\src\libsodium\crypto_box\curve25519xchacha20poly1305\box_seal_curve25519xchacha20poly1305.c">
+      <Filter>crypto_box\curve25519xchacha20poly1305</Filter>
+    </ClCompile>
     <ClCompile Include="..\..\..\..\src\libsodium\crypto_box\curve25519xsalsa20poly1305\box_curve25519xsalsa20poly1305.c">
       <Filter>crypto_box\curve25519xsalsa20poly1305</Filter>
     </ClCompile>
diff --git a/builds/msvc/vs2017/libsodium/libsodium.vcxproj b/builds/msvc/vs2017/libsodium/libsodium.vcxproj
index 1189b357..8b59d53e 100644
--- a/builds/msvc/vs2017/libsodium/libsodium.vcxproj
+++ b/builds/msvc/vs2017/libsodium/libsodium.vcxproj
@@ -88,6 +88,7 @@
     <ClCompile Include="..\..\..\..\src\libsodium\crypto_box\crypto_box_easy.c" />
     <ClCompile Include="..\..\..\..\src\libsodium\crypto_box\crypto_box_seal.c" />
     <ClCompile Include="..\..\..\..\src\libsodium\crypto_box\curve25519xchacha20poly1305\box_curve25519xchacha20poly1305.c" />
+    <ClCompile Include="..\..\..\..\src\libsodium\crypto_box\curve25519xchacha20poly1305\box_seal_curve25519xchacha20poly1305.c" />
     <ClCompile Include="..\..\..\..\src\libsodium\crypto_box\curve25519xsalsa20poly1305\box_curve25519xsalsa20poly1305.c" />
     <ClCompile Include="..\..\..\..\src\libsodium\crypto_core\curve25519\ref10\curve25519_ref10.c" />
     <ClCompile Include="..\..\..\..\src\libsodium\crypto_core\hchacha20\core_hchacha20.c" />
diff --git a/builds/msvc/vs2017/libsodium/libsodium.vcxproj.filters b/builds/msvc/vs2017/libsodium/libsodium.vcxproj.filters
index 5fb9bfcf..99cfa569 100644
--- a/builds/msvc/vs2017/libsodium/libsodium.vcxproj.filters
+++ b/builds/msvc/vs2017/libsodium/libsodium.vcxproj.filters
@@ -54,6 +54,9 @@
     <ClCompile Include="..\..\..\..\src\libsodium\crypto_box\curve25519xchacha20poly1305\box_curve25519xchacha20poly1305.c">
       <Filter>crypto_box\curve25519xchacha20poly1305</Filter>
     </ClCompile>
+    <ClCompile Include="..\..\..\..\src\libsodium\crypto_box\curve25519xchacha20poly1305\box_seal_curve25519xchacha20poly1305.c">
+      <Filter>crypto_box\curve25519xchacha20poly1305</Filter>
+    </ClCompile>
     <ClCompile Include="..\..\..\..\src\libsodium\crypto_box\curve25519xsalsa20poly1305\box_curve25519xsalsa20poly1305.c">
       <Filter>crypto_box\curve25519xsalsa20poly1305</Filter>
     </ClCompile>
diff --git a/libsodium.vcxproj b/libsodium.vcxproj
index d7d7cad4..cd0b7299 100644
--- a/libsodium.vcxproj
+++ b/libsodium.vcxproj
@@ -326,6 +326,7 @@
     <ClCompile Include="src\libsodium\crypto_box\crypto_box_easy.c" />
     <ClCompile Include="src\libsodium\crypto_box\crypto_box_seal.c" />
     <ClCompile Include="src\libsodium\crypto_box\curve25519xchacha20poly1305\box_curve25519xchacha20poly1305.c" />
+    <ClCompile Include="src\libsodium\crypto_box\curve25519xchacha20poly1305\box_seal_curve25519xchacha20poly1305.c" />
     <ClCompile Include="src\libsodium\crypto_box\curve25519xsalsa20poly1305\box_curve25519xsalsa20poly1305.c" />
     <ClCompile Include="src\libsodium\crypto_core\curve25519\ref10\curve25519_ref10.c" />
     <ClCompile Include="src\libsodium\crypto_core\hchacha20\core_hchacha20.c" />
diff --git a/libsodium.vcxproj.filters b/libsodium.vcxproj.filters
index de63f2e9..b0536551 100644
--- a/libsodium.vcxproj.filters
+++ b/libsodium.vcxproj.filters
@@ -48,6 +48,9 @@
     <ClCompile Include="src\libsodium\crypto_box\curve25519xchacha20poly1305\box_curve25519xchacha20poly1305.c">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="src\libsodium\crypto_box\curve25519xchacha20poly1305\box_seal_curve25519xchacha20poly1305.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
     <ClCompile Include="src\libsodium\crypto_box\curve25519xsalsa20poly1305\box_curve25519xsalsa20poly1305.c">
       <Filter>Source Files</Filter>
     </ClCompile>