diff --git a/builds/msvc/vs2012/libsodium/libsodium.vcxproj b/builds/msvc/vs2012/libsodium/libsodium.vcxproj
index 6c7309dd..55b6b3ca 100644
--- a/builds/msvc/vs2012/libsodium/libsodium.vcxproj
+++ b/builds/msvc/vs2012/libsodium/libsodium.vcxproj
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project DefaultTargets="Build" ToolsVersion="12.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <PropertyGroup Label="Globals">
     <ProjectGuid>{A185B162-6CB6-4502-B03F-B56F7699A8D9}</ProjectGuid>
     <ProjectName>libsodium</ProjectName>
diff --git a/builds/msvc/vs2015/libsodium/libsodium.vcxproj b/builds/msvc/vs2015/libsodium/libsodium.vcxproj
index e914b83a..8fc1e276 100644
--- a/builds/msvc/vs2015/libsodium/libsodium.vcxproj
+++ b/builds/msvc/vs2015/libsodium/libsodium.vcxproj
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project DefaultTargets="Build" ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <PropertyGroup Label="Globals">
     <ProjectGuid>{A185B162-6CB6-4502-B03F-B56F7699A8D9}</ProjectGuid>
     <ProjectName>libsodium</ProjectName>