diff --git a/src/Basefold.ipynb b/src/Basefold.ipynb
index fb3c476..85a7785 100644
--- a/src/Basefold.ipynb
+++ b/src/Basefold.ipynb
@@ -230,7 +230,7 @@
     "def rep_encode(m, k0, c):\n",
     "    assert len(m) % k0 == 0, \"len(m): %d is not a multiple of k0: %d\" % (len(m), k0)\n",
     "    code = []\n",
-    "    for i in range(0, c*len(m), k0):\n",
+    "    for i in range(0, len(m), k0):\n",
     "        for j in range(0, c):\n",
     "            code += m[i:i+k0]\n",
     "    return code"