diff --git a/builds/msvc/vs2010/libsodium/libsodium.vcxproj b/builds/msvc/vs2010/libsodium/libsodium.vcxproj
index fd9e7ddc..798bfb31 100644
--- a/builds/msvc/vs2010/libsodium/libsodium.vcxproj
+++ b/builds/msvc/vs2010/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/vs2010/test/test.vcxproj b/builds/msvc/vs2010/test/test.vcxproj
index 6daaefb3..13d15254 100644
--- a/builds/msvc/vs2010/test/test.vcxproj
+++ b/builds/msvc/vs2010/test/test.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>{4EDBA07C-2F08-4C9E-805F-A4921814C117}</ProjectGuid>
     <ProjectName>test</ProjectName>
diff --git a/builds/msvc/vs2012/libsodium/libsodium.vcxproj b/builds/msvc/vs2012/libsodium/libsodium.vcxproj
index 5025ee71..b80226b6 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/vs2012/test/test.vcxproj b/builds/msvc/vs2012/test/test.vcxproj
index 1eea80a4..f0f19925 100644
--- a/builds/msvc/vs2012/test/test.vcxproj
+++ b/builds/msvc/vs2012/test/test.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>{4EDBA07C-2F08-4C9E-805F-A4921814C117}</ProjectGuid>
     <ProjectName>test</ProjectName>