diff --git a/gio/tests/converter-stream.c b/gio/tests/converter-stream.c
index 45fb6a673..dac3da834 100644
--- a/gio/tests/converter-stream.c
+++ b/gio/tests/converter-stream.c
@@ -972,7 +972,7 @@ test_converter_pollable (void)
   GPollableOutputStream *pollable_out;
   GConverter *expander, *compressor;
   GError *error;
-  int i;
+  gsize i;
 
   expander = g_expander_converter_new ();
   expanded = g_malloc (100*1000); /* Large enough */