diff --git a/src/userfunc.c b/src/userfunc.c
index 0f194d5..92b5203 100644
--- a/src/userfunc.c
+++ b/src/userfunc.c
@@ -2095,7 +2095,8 @@
 {
     return ufunc->uf_name[0] != K_SPECIAL
 	    && (ufunc->uf_flags & FC_LAMBDA) == 0
-	    && vim_strchr(ufunc->uf_name, AUTOLOAD_CHAR) == NULL;
+	    && vim_strchr(ufunc->uf_name, AUTOLOAD_CHAR) == NULL
+	    && !isdigit(ufunc->uf_name[0]);
 }
 
 /*