diff --git a/libopenjpeg/openjpeg.h b/libopenjpeg/openjpeg.h
index 916755b3..5dbb1b25 100644
--- a/libopenjpeg/openjpeg.h
+++ b/libopenjpeg/openjpeg.h
@@ -33,7 +33,7 @@
 #ifndef OPENJPEG_H
 #define OPENJPEG_H
 
-#if defined(OPJ_STATIC) || !(defined(WIN32) || defined(__WIN32__))
+#if defined(OPJ_STATIC) || (!defined(WIN32) && !defined(__MINGW32__)) || defined(__WIN32__)
 	#define OPJ_API
 	#define OPJ_CALLCONV
 #else