--- muttlib.c
+++ muttlib.c	2007-05-16 09:26:24.607110614 +0000
@@ -537,8 +537,8 @@ char *mutt_gecos_name (char *dest, size_
     if (dest[idx] == '&')
     {
       memmove (&dest[idx + pwnl], &dest[idx + 1],
-	       MAX(destlen - idx - pwnl - 1, 0));
-      memcpy (&dest[idx], pw->pw_name, MIN(destlen - idx - 1, pwnl));
+	       MAX((ssize_t)(destlen - idx - pwnl - 1), 0));
+      memcpy (&dest[idx], pw->pw_name, MIN((ssize_t)(destlen - idx - 1), pwnl));
       dest[idx] = toupper ((unsigned char) dest[idx]);
     }
   }