diff --git a/cmake/OptimalOptions.cmake b/cmake/OptimalOptions.cmake
index e4d5c56..eba8624 100644
--- a/cmake/OptimalOptions.cmake
+++ b/cmake/OptimalOptions.cmake
@@ -11,8 +11,8 @@ IF(MSVC)
 #	SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /arch:SSE2 /fp:fast")
 
 	# Optimization flags.
-	SET(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS} /O2 /Ob2 /Oi /Ot /Oy /GL")
-	SET(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS} /O2 /Ob2 /Oi /Ot /Oy /GL")
+	SET(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} /O2 /Ob2 /Oi /Ot /Oy /GL")
+	SET(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /O2 /Ob2 /Oi /Ot /Oy /GL")
 	SET(CMAKE_EXE_LINKER_FLAGS_RELEASE "${CMAKE_EXE_LINKER_FLAGS_RELEASE} /LTCG")
 	SET(CMAKE_SHARED_LINKER_FLAGS_RELEASE "${CMAKE_SHARED_LINKER_FLAGS_RELEASE} /LTCG")
 	SET(CMAKE_MODULE_LINKER_FLAGS_RELEASE "${CMAKE_MODULE_LINKER_FLAGS_RELEASE} /LTCG")