diff --git a/tests/mapping-test.c b/tests/mapping-test.c
index 27c6d8366..ad776fad1 100644
--- a/tests/mapping-test.c
+++ b/tests/mapping-test.c
@@ -191,7 +191,9 @@ test_child_private (gchar *argv0)
   gsize len;
   gchar *child_argv[4];
   GPid  child_pid;
+#ifndef G_OS_WIN32
   GMainLoop *loop;
+#endif
   gchar pid[100];
   
 #ifdef G_OS_WIN32