diff --git a/zzip/conf.h b/zzip/conf.h
index 27b834a..7f01456 100644
--- a/zzip/conf.h
+++ b/zzip/conf.h
@@ -203,7 +203,7 @@
 #     endif


-#if defined ZZIP_EXPORTS || defined ZZIPLIB_EXPORTS
+#if defined ZZIP_EXPORTS || defined ZZIPLIB_EXPORTS || defined libzzip_EXPORTS // CMake export defines
 # undef ZZIP_DLL
 #define ZZIP_DLL 1
 #endif