diff --git a/src/xcb_errors.c b/src/xcb_errors.c
index 6f2f1ac..8c0a189 100644
--- a/src/xcb_errors.c
+++ b/src/xcb_errors.c
@@ -91,7 +91,7 @@ int xcb_errors_context_new(xcb_connection_t *conn, xcb_errors_context_t **c)
 	ctx = *c;
 	ctx->extensions = NULL;
 
-	if (!register_extensions(ctx, conn))
+	if (register_extensions(ctx, conn) != 0)
 		goto error_out;
 
 	return 0;