diff --git a/CMakeLists.txt b/CMakeLists.txt
index b1410812..f1dada75 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -168,7 +168,8 @@ if (MSVC)
 
   # override CMake default RelWithDebInfo flags. This is important to ensure
   # good performance
-  set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "/MT /Zi /O2 /Ob2 /D NDEBUG")
+  set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "/Zi /O2 /Ob2 /D NDEBUG")
+  set(CMAKE_C_FLAGS_RELWITHDEBINFO "/Zi /O2 /Ob2 /D NDEBUG")
 else (MSVC)
   set(MSVC_3RDPARTY_ROOT NOT_FOUND CACHE PATH "Location where the third-party dependencies are extracted")
 endif (MSVC)