diff --git a/_test/extra.txt b/_test/extra.txt
index 332c06d..3951883 100644
--- a/_test/extra.txt
+++ b/_test/extra.txt
@@ -456,3 +456,11 @@ x
 <p>&amp;#x0000041;</p>
 //= = = = = = = = = = = = = = = = = = = = = = = =//
 
+33: \x01 should be escaped all the time
+    OPTIONS: {"enableEscape": true}
+//- - - - - - - - -//
+[x](\x01)
+//- - - - - - - - -//
+<p><a href="%01">x</a></p>
+//= = = = = = = = = = = = = = = = = = = = = = = =//
+
diff --git a/util/util.go b/util/util.go
index e609a75..efd1b9b 100644
--- a/util/util.go
+++ b/util/util.go
@@ -709,7 +709,7 @@ func URLEscape(v []byte, resolveReference bool) []byte {
 			n = i
 			continue
 		}
-		if int(u8len) >= len(v) {
+		if int(u8len) > len(v) {
 			u8len = int8(len(v) - 1)
 		}
 		if u8len == 0 {