diff --git a/src/ex_docmd.c b/src/ex_docmd.c
index f4bdf7b..77a7a71 100644
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -3307,7 +3307,7 @@
 find_ex_command(
 	exarg_T *eap,
 	int	*full UNUSED,
-	int	(*lookup)(char_u *, size_t, void *, cctx_T *) UNUSED,
+	int	(*lookup)(char_u *, size_t, cctx_T *) UNUSED,
 	cctx_T	*cctx UNUSED)
 {
     int		len;
@@ -3416,7 +3416,7 @@
 
 	    // Recognize an assignment if we recognize the variable name:
 	    // "g:var = expr"
-	    // "var = expr"  where "var" is a local var name.
+	    // "var = expr"  where "var" is a variable name.
 	    if (*eap->cmd == '@')
 		p = eap->cmd + 2;
 	    oplen = assignment_len(skipwhite(p), &heredoc);
@@ -3426,7 +3426,7 @@
 			|| *eap->cmd == '&'
 			|| *eap->cmd == '$'
 			|| *eap->cmd == '@'
-			|| lookup(eap->cmd, p - eap->cmd, NULL, cctx) == OK)
+			|| lookup(eap->cmd, p - eap->cmd, cctx) == OK)
 		{
 		    eap->cmdidx = CMD_var;
 		    return eap->cmd;
@@ -3445,7 +3445,7 @@
 	// If it is an ID it might be a variable with an operator on the next
 	// line, if the variable exists it can't be an Ex command.
 	if (p > eap->cmd && ends_excmd(*skipwhite(p))
-		&& (lookup(eap->cmd, p - eap->cmd, NULL, cctx) == OK
+		&& (lookup(eap->cmd, p - eap->cmd, cctx) == OK
 		    || (ASCII_ISALPHA(eap->cmd[0]) && eap->cmd[1] == ':')))
 	{
 	    eap->cmdidx = CMD_eval;