diff --git a/cmake/flags.cmake b/cmake/flags.cmake
index e9e0e3958..10386b174 100644
--- a/cmake/flags.cmake
+++ b/cmake/flags.cmake
@@ -61,11 +61,11 @@ if (CMAKE_CXX_COMPILER_ID MATCHES GNU)
     add_definitions(/DHAVE_BUILTIN_CLEAR_CACHE)
 
 elseif (CMAKE_CXX_COMPILER_ID MATCHES MSVC)
-    set(CMAKE_C_FLAGS_RELEASE "/MT /O2 /Oi /DNDEBUG /GL")
-    set(CMAKE_CXX_FLAGS_RELEASE "/MT /O2 /Oi /DNDEBUG /GL")
+    set(CMAKE_C_FLAGS_RELEASE "/MP /MT /O2 /Oi /DNDEBUG /GL")
+    set(CMAKE_CXX_FLAGS_RELEASE "/MP /MT /O2 /Oi /DNDEBUG /GL")
 
-    set(CMAKE_C_FLAGS_RELWITHDEBINFO "/Ob1 /Zi /DRELWITHDEBINFO")
-    set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "/Ob1 /Zi /DRELWITHDEBINFO")
+    set(CMAKE_C_FLAGS_RELWITHDEBINFO "/MP /Ob1 /Zi /DRELWITHDEBINFO")
+    set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "/MP /Ob1 /Zi /DRELWITHDEBINFO")
 
     add_definitions(/D_CRT_SECURE_NO_WARNINGS)
     add_definitions(/D_CRT_NONSTDC_NO_WARNINGS)