diff --git a/crypto/perlasm/x86asm.pl b/crypto/perlasm/x86asm.pl
index bef266707..ea54a1edc 100644
--- a/crypto/perlasm/x86asm.pl
+++ b/crypto/perlasm/x86asm.pl
@@ -90,7 +90,7 @@ $tmp
 #ifdef OUT
 #define OK	1
 #define ALIGN	4
-#if defined(__CYGWIN__) || defined(__DJGPP__)
+#if defined(__CYGWIN__) || defined(__DJGPP__) || defined(__MINGW32__)
 #undef SIZE
 #undef TYPE
 #define SIZE(a,b)