diff --git a/glib/gspawn-win32.c b/glib/gspawn-win32.c
index 638bac5cd..182928cb4 100644
--- a/glib/gspawn-win32.c
+++ b/glib/gspawn-win32.c
@@ -324,7 +324,7 @@ read_helper_report (int      fd,
 		    gintptr  report[2],
 		    GError **error)
 {
-  gint bytes = 0;
+  gsize bytes = 0;
   
   while (bytes < sizeof(gintptr)*2)
     {