diff --git a/sdk/include/crt/_mingw.h b/sdk/include/crt/_mingw.h
index 1d79edaff1c..b63e0b3b17a 100644
--- a/sdk/include/crt/_mingw.h
+++ b/sdk/include/crt/_mingw.h
@@ -7,7 +7,9 @@
 #ifndef _INC_MINGW
 #define _INC_MINGW
 
+#ifndef _INTEGRAL_MAX_BITS
 #define _INTEGRAL_MAX_BITS 64
+#endif
 
 #ifndef MINGW64
 #define MINGW64