diff --git a/cmake/os.cmake b/cmake/os.cmake
index be2368f9..5efeceef 100644
--- a/cmake/os.cmake
+++ b/cmake/os.cmake
@@ -1,4 +1,4 @@
-if (WIN32 OR CMAKE_SYSTEM_NAME MATCHES "Windows" OR CMAKE_SYSTEM_NAME MATCHES "MSYS" OR CMAKE_SYSTEM_NAME MATCHES "MINGW")
+if (WIN32 OR CMAKE_SYSTEM_NAME MATCHES "MSYS")
     set(XMRIG_OS_WIN ON)
 elseif (APPLE)
     set(XMRIG_OS_APPLE ON)