diff --git a/girepository/tools/compiler.c b/girepository/tools/compiler.c
index 7e0a6004b..350b906d0 100644
--- a/girepository/tools/compiler.c
+++ b/girepository/tools/compiler.c
@@ -107,8 +107,10 @@ write_out_typelib (gchar *prefix,
   if (output == NULL)
     {
       file = stdout;
+      file_obj = NULL;
       filename = NULL;
       tmp_filename = NULL;
+      tmp_file_obj = NULL;
 #ifdef G_OS_WIN32
       setmode (fileno (file), _O_BINARY);
 #endif