diff --git a/lib/localcharset.c b/lib/localcharset.c
index 10c69b067..5c257a670 100644
--- a/lib/localcharset.c
+++ b/lib/localcharset.c
@@ -106,7 +106,7 @@ static const char * volatile charset_aliases;
 
 /* Return a pointer to the contents of the charset.alias file.  */
 static const char *
-get_charset_aliases ()
+get_charset_aliases (void)
 {
   const char *cp;