diff --git a/src/ex_docmd.c b/src/ex_docmd.c
index 6826951..c4cf1f9 100644
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -2150,9 +2150,9 @@
 	    && ASCII_ISUPPER(*ea.cmd)
 	    && has_cmdundefined())
     {
-	char_u *p = ea.cmd;
 	int ret;
 
+	p = ea.cmd;
 	while (ASCII_ISALNUM(*p))
 	    ++p;
 	p = vim_strnsave(ea.cmd, p - ea.cmd);
diff --git a/src/vim.h b/src/vim.h
index 887a76d..cb2a9e5 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -1326,6 +1326,7 @@
     EVENT_SHELLFILTERPOST,	/* after ":1,2!cmd", ":w !cmd", ":r !cmd". */
     EVENT_TEXTCHANGED,		/* text was modified */
     EVENT_TEXTCHANGEDI,		/* text was modified in Insert mode*/
+    EVENT_CMDUNDEFINED,		/* command undefined */
     NUM_EVENTS			/* MUST be the last one */
 };