diff --git a/httpbin/core.py b/httpbin/core.py
index aef82623..e23cc86b 100644
--- a/httpbin/core.py
+++ b/httpbin/core.py
@@ -1449,7 +1449,7 @@ def random_bytes(n):
     response = make_response()
 
     # Note: can't just use os.urandom here because it ignores the seed
-    response.data = bytearray(random.randint(0, 255) for i in range(n))
+    response.data = bytes(random.randint(0, 255) for i in range(n))
     response.content_type = "application/octet-stream"
     return response