diff --git a/contrib/poly2tri/poly2tri/common/dll_symbol.h b/contrib/poly2tri/poly2tri/common/dll_symbol.h
index 6776f5455..19976c742 100644
--- a/contrib/poly2tri/poly2tri/common/dll_symbol.h
+++ b/contrib/poly2tri/poly2tri/common/dll_symbol.h
@@ -32,7 +32,7 @@
 #pragma once
 
 #if defined(_WIN32)
-#  pragma warning disable 4273
+#  pragma warning( disable: 4273)
 #  define P2T_COMPILER_DLLEXPORT __declspec(dllexport)
 #  define P2T_COMPILER_DLLIMPORT __declspec(dllimport)
 #elif defined(__GNUC__)