diff --git a/lib/diff.tcl b/lib/diff.tcl
index 43565e412f..18aba3eae3 100644
--- a/lib/diff.tcl
+++ b/lib/diff.tcl
@@ -220,6 +220,7 @@ proc read_diff {fd} {
 
 		if {[string match {mode *} $line]
 			|| [string match {new file *} $line]
+			|| [regexp {^(old|new) mode *} $line]
 			|| [string match {deleted file *} $line]
 			|| [string match {deleted symlink} $line]
 			|| [string match {Binary files * and * differ} $line]