diff --git a/tools/test.c b/tools/test.c
index 7bbb7e5..11c98f5 100644
--- a/tools/test.c
+++ b/tools/test.c
@@ -95,7 +95,8 @@ int main(int argc, char * argv[])
 	GtkIconSize huge;
 	int o;
 
-	setlocale(LC_ALL, "");
+	if(setlocale(LC_ALL, "") == NULL)
+		_error("setlocale", 1);
 	bindtextdomain(PACKAGE, LOCALEDIR);
 	textdomain(PACKAGE);
 	gtk_init(&argc, &argv);