diff --git a/seed/challenges/08-coding-interview-questions-and-take-home-assignments/coding-interview-data-structure-questions.json b/seed/challenges/08-coding-interview-questions-and-take-home-assignments/coding-interview-data-structure-questions.json
index 8a7cf3d2c98..11525bd8107 100644
--- a/seed/challenges/08-coding-interview-questions-and-take-home-assignments/coding-interview-data-structure-questions.json
+++ b/seed/challenges/08-coding-interview-questions-and-take-home-assignments/coding-interview-data-structure-questions.json
@@ -372,7 +372,7 @@
         "    // this method will remove an element from a set",
         "    this.remove = function(element) {",
         "        if(this.has(element)){",
-        "            index = collection.indexOf(element);",
+        "           var index = collection.indexOf(element);",
         "            collection.splice(index,1);",
         "            return true;",
         "        }",
@@ -424,7 +424,7 @@
         "   // this method will remove an element from a set",
         "    this.remove = function(element) {",
         "        if(this.has(element)){",
-        "            index = collection.indexOf(element);",
+        "           var index = collection.indexOf(element);",
         "            collection.splice(index,1);",
         "            return true;",
         "        }",
@@ -481,7 +481,7 @@
         "    // this method will remove an element from a set",
         "    this.remove = function(element) {",
         "        if(this.has(element)){",
-        "            index = collection.indexOf(element);",
+        "           var index = collection.indexOf(element);",
         "            collection.splice(index,1);",
         "            return true;",
         "        }",
@@ -550,7 +550,7 @@
         "    // this method will remove an element from a set",
         "    this.remove = function(element) {",
         "        if(this.has(element)){",
-        "            index = collection.indexOf(element);",
+        "           var index = collection.indexOf(element);",
         "            collection.splice(index,1);",
         "            return true;",
         "        }",
@@ -630,7 +630,7 @@
         "    // this method will remove an element from a set",
         "    this.remove = function(element) {",
         "        if(this.has(element)){",
-        "            index = collection.indexOf(element);",
+        "           var index = collection.indexOf(element);",
         "            collection.splice(index,1);",
         "            return true;",
         "        }",