diff --git a/visualc/VS2010/PolarSSL.vcxproj b/visualc/VS2010/PolarSSL.vcxproj
index d7854ae50..d474a1dbf 100644
--- a/visualc/VS2010/PolarSSL.vcxproj
+++ b/visualc/VS2010/PolarSSL.vcxproj
@@ -192,6 +192,7 @@
     <ClInclude Include="..\..\include\polarssl\ssl_cache.h" />
     <ClInclude Include="..\..\include\polarssl\ssl_ciphersuites.h" />
     <ClInclude Include="..\..\include\polarssl\ssl.h" />
+    <ClInclude Include="..\..\include\polarssl\threading.h" />
     <ClInclude Include="..\..\include\polarssl\timing.h" />
     <ClInclude Include="..\..\include\polarssl\version.h" />
     <ClInclude Include="..\..\include\polarssl\x509_crl.h" />
@@ -252,6 +253,7 @@
     <ClCompile Include="..\..\library\ssl_cli.c" />
     <ClCompile Include="..\..\library\ssl_srv.c" />
     <ClCompile Include="..\..\library\ssl_tls.c" />
+    <ClCompile Include="..\..\library\threading.c" />
     <ClCompile Include="..\..\library\timing.c" />
     <ClCompile Include="..\..\library\version.c" />
     <ClCompile Include="..\..\library\x509.c" />
diff --git a/visualc/VS6/polarssl.dsp b/visualc/VS6/polarssl.dsp
index 35025a2d7..47fdce0ba 100644
--- a/visualc/VS6/polarssl.dsp
+++ b/visualc/VS6/polarssl.dsp
@@ -289,6 +289,10 @@ SOURCE=..\..\library\ssl_tls.c
 # End Source File
 # Begin Source File
 
+SOURCE=..\..\library\threading.c
+# End Source File
+# Begin Source File
+
 SOURCE=..\..\library\timing.c
 # End Source File
 # Begin Source File
@@ -529,6 +533,10 @@ SOURCE=..\..\include\polarssl\ssl.h
 # End Source File
 # Begin Source File
 
+SOURCE=..\..\include\polarssl\threading.h
+# End Source File
+# Begin Source File
+
 SOURCE=..\..\include\polarssl\timing.h
 # End Source File
 # Begin Source File