diff --git a/include/grpc/impl/codegen/port_platform.h b/include/grpc/impl/codegen/port_platform.h
index cd989d664ca0c7bbb219a79879fb7ca307336c72..4633fa12e84767d836b53b245024387759579992 100644
--- a/include/grpc/impl/codegen/port_platform.h
+++ b/include/grpc/impl/codegen/port_platform.h
@@ -361,7 +361,7 @@ typedef unsigned __int64 uint64_t;
 #define GPR_MAX_ALIGNMENT 16
 
 #ifndef GRPC_MUST_USE_RESULT
-#ifdef __GNUC__
+#if defined(__GNUC__) && !defined(__MINGW32__)
 #define GRPC_MUST_USE_RESULT __attribute__((warn_unused_result))
 #else
 #define GRPC_MUST_USE_RESULT