diff --git a/win_build/libboinc_staticcrt_vs2013.vcxproj b/win_build/libboinc_staticcrt_vs2013.vcxproj
index cd8c46ba71..00540c4e2b 100644
--- a/win_build/libboinc_staticcrt_vs2013.vcxproj
+++ b/win_build/libboinc_staticcrt_vs2013.vcxproj
@@ -250,6 +250,7 @@
+
CompileAsCpp
@@ -288,6 +289,7 @@
+
diff --git a/win_build/libboinc_vs2013.vcxproj b/win_build/libboinc_vs2013.vcxproj
index 70677ee3da..cd9a47dd5e 100644
--- a/win_build/libboinc_vs2013.vcxproj
+++ b/win_build/libboinc_vs2013.vcxproj
@@ -231,6 +231,7 @@
+
@@ -295,6 +296,7 @@
+
CompileAsCpp