diff --git a/cmake/all.cmake b/cmake/all.cmake
index 1f97c5d0..7bdaf8da 100644
--- a/cmake/all.cmake
+++ b/cmake/all.cmake
@@ -55,9 +55,11 @@ set(MEMORYCHECK_COMMAND_OPTIONS "${MEMORYCHECK_COMMAND_OPTIONS} --error-exitcode
 if ("${CMAKE_SYSTEM_NAME}" STREQUAL "Windows")
     message(STATUS "TARGET_PC")
     set(TARGET_PC 1)
-    
-    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /MP")
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /MP")
+
+    if (NOT MINGW)
+        set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /MP")
+        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /MP")
+    endif()
 
     LIST(APPEND PLATFORM_LINKLIBS
         opengl32.lib