diff --git a/src/regex.nim b/src/regex.nim
index fae7223..7e27612 100644
--- a/src/regex.nim
+++ b/src/regex.nim
@@ -735,13 +735,17 @@ func endsWith*(s: string, pattern: Regex2): bool {.inline, raises: [].} =
 
   debugCheckUtf8(s, pattern)
   result = false
+  let binFlag = regexArbitraryBytes in pattern.toRegex.flags
   var
     m: RegexMatch2
     i = 0
   while i < s.len:
     result = match(s, pattern, m, i)
     if result: return
-    s.runeIncAt(i)
+    if binFlag:
+      inc i
+    else:
+      s.runeIncAt(i)
 
 func addsubstr(
   result: var string, s: string, first, last: int
diff --git a/tests/tests2.nim b/tests/tests2.nim
index d4af1a1..12affe0 100644
--- a/tests/tests2.nim
+++ b/tests/tests2.nim
@@ -3154,6 +3154,15 @@ when not defined(js) or NimMajor >= 2:
         m.groupsCount == 0
       check match("\x02\xF8\x95", re2(r"\x{2F895}", flags)) and 
         m.groupsCount == 0
+    check startsWith("\xff\xf0", re2(r"\xff", flags))
+    check(not startsWith("\xf0\xff", re2(r"\xff", flags)))
+    check endsWith("\xf0\xff", re2(r"\xff", flags))
+    check(not endsWith("\xff\xf0", re2(r"\xff", flags)))
+    check split("\xf0\xff\xf0", re2(r"\xff", flags)) == @["\xf0", "\xf0"]
+    check splitIncl("\xf0\xff\xf0", re2(r"(\xff)", flags)) ==
+      @["\xf0", "\xff", "\xf0"]
+    check contains("\xf0\xff\xf0", re2(r"\xff", flags))
+    check(not contains("\xf0\xf0", re2(r"\xff", flags)))
 
   test "tarbitrary_bytes_flags":
     let flags = {regexArbitraryBytes}