diff --git a/gettext-tools/src/msgl-check.c b/gettext-tools/src/msgl-check.c
index 3aa526d..fce61ff 100644
--- a/gettext-tools/src/msgl-check.c
+++ b/gettext-tools/src/msgl-check.c
@@ -760,7 +760,7 @@ check_header_entry (const message_ty *mp, const char *msgstr_string)
     "Language-Team", "MIME-Version", "Content-Type",
     "Content-Transfer-Encoding",
     /* These are recommended but not yet required.  */
-    "Language"
+    "Language:"
   };
   static const char *default_values[] =
   {
