diff --git a/src/diff.c b/src/diff.c
index a46f0bf..1873767 100644
--- a/src/diff.c
+++ b/src/diff.c
@@ -1310,6 +1310,9 @@
     else
 #endif
     {
+	if (check_restricted())
+	    goto theend;
+
 	// Build the patch command and execute it.  Ignore errors.  Switch to
 	// cooked mode to allow the user to respond to prompts.
 	vim_snprintf((char *)buf, buflen, "patch -o %s %s < %s",
@@ -1380,7 +1383,8 @@
 
 		    // Do filetype detection with the new name.
 		    if (au_has_group((char_u *)"filetypedetect"))
-			do_cmdline_cmd((char_u *)":doau filetypedetect BufRead");
+			do_cmdline_cmd(
+				     (char_u *)":doau filetypedetect BufRead");
 		}
 	    }
 	}