diff --git a/gtypelib.c b/gtypelib.c
index 395a83dc9..bfd7fd416 100644
--- a/gtypelib.c
+++ b/gtypelib.c
@@ -1960,7 +1960,7 @@ _g_typelib_init (GTypelib *typelib)
 	      g_string_append (shlib_full, ".la");
 	      typelib->module = g_module_open (shlib_full->str, G_MODULE_BIND_LAZY);
 	      if (typelib->module == NULL)
-		g_string_overwrite (shlib_full, strlen (shlib_full->str)-2, "so");
+		g_string_overwrite (shlib_full, strlen (shlib_full->str)-2, G_MODULE_SUFFIX);
 	      typelib->module = g_module_open (shlib_full->str, G_MODULE_BIND_LAZY);
 
 	      g_string_free (shlib_full, TRUE);