diff --git a/src/eval.c b/src/eval.c
index 6e8c26f4a7..780ed9eca0 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -20461,6 +20461,7 @@ ex_function(eap)
     exarg_T	*eap;
 {
     char_u	*theline;
+    int		i;
     int		j;
     int		c;
     int		saved_did_emsg;
@@ -20707,6 +20708,15 @@ ex_function(eap)
 	    arg = vim_strsave(arg);
 	    if (arg == NULL)
 		goto erret;
+
+	    /* Check for duplicate argument name. */
+	    for (i = 0; i < newargs.ga_len; ++i)
+		if (STRCMP(((char_u **)(newargs.ga_data))[i], arg) == 0)
+		{
+		    EMSG2(_("E853: Duplicate argument name: %s"), arg);
+		    goto erret;
+		}
+
 	    ((char_u **)(newargs.ga_data))[newargs.ga_len] = arg;
 	    *p = c;
 	    newargs.ga_len++;
diff --git a/src/version.c b/src/version.c
index 854cb9c716..96f2ee49aa 100644
--- a/src/version.c
+++ b/src/version.c
@@ -709,6 +709,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    325,
 /**/
     324,
 /**/