diff --git a/spine-c/include/spine/AttachmentLoader.h b/spine-c/include/spine/AttachmentLoader.h
index c447de35e..b02556174 100644
--- a/spine-c/include/spine/AttachmentLoader.h
+++ b/spine-c/include/spine/AttachmentLoader.h
@@ -40,6 +40,9 @@ struct AttachmentLoader {
 	const char* error2;
 
 	const void* const vtable;
+#ifdef __cplusplus
+	AttachmentLoader () : error1(0), error2(0), vtable(0) {}
+#endif
 };
 
 void AttachmentLoader_dispose (AttachmentLoader* self);