diff --git a/depends/CMakeLists.txt b/depends/CMakeLists.txt
index e1c07bd92..bf2064cb8 100644
--- a/depends/CMakeLists.txt
+++ b/depends/CMakeLists.txt
@@ -4,7 +4,9 @@ add_subdirectory(lua)
 add_subdirectory(md5)
 add_subdirectory(protobuf)
 add_subdirectory(googletest)
-set_target_properties(gtest PROPERTIES COMPILE_FLAGS "-Wno-maybe-uninitialized -Wno-sign-compare")
+if(UNIX)
+    set_target_properties(gtest PROPERTIES COMPILE_FLAGS "-Wno-maybe-uninitialized -Wno-sign-compare")
+endif()
 
 # Don't build tinyxml if it's being externally linked against.
 if(NOT TinyXML_FOUND)