diff --git a/arrays_strings/permutation/permutation_solution.ipynb b/arrays_strings/permutation/permutation_solution.ipynb
index 4bc8726..23be349 100644
--- a/arrays_strings/permutation/permutation_solution.ipynb
+++ b/arrays_strings/permutation/permutation_solution.ipynb
@@ -143,10 +143,10 @@
     "def permutations_alt(str1, str2):\n",
     "    if len(str1) != len(str2):\n",
     "        return False\n",
-    "    unique_counts2 = defaultdict(int)\n",
+    "    unique_counts1 = defaultdict(int)\n",
     "    unique_counts2 = defaultdict(int)\n",
     "    for char in str1:\n",
-    "        unique_counts2[char] += 1\n",
+    "        unique_counts1[char] += 1\n",
     "    for char in str2:\n",
     "        unique_counts2[char] += 1\n",
     "    return unique_counts1 == unique_counts2"