diff --git a/glib/gnulib/vasnprintf.c b/glib/gnulib/vasnprintf.c
index ee0a43a26..018e0d99d 100644
--- a/glib/gnulib/vasnprintf.c
+++ b/glib/gnulib/vasnprintf.c
@@ -123,6 +123,11 @@ print_long_long (char *buf,
       digits = upper;
       negative = FALSE;
       break;
+    case 'u':
+      base = 10;
+      digits = lower;
+      negative = FALSE;
+      break;
     default:
       base = 10;
       digits = lower;