diff --git a/katas/es1/language/__all__.json b/katas/es1/language/__all__.json
index 7fca3ec..d5ce7b8 100644
--- a/katas/es1/language/__all__.json
+++ b/katas/es1/language/__all__.json
@@ -384,7 +384,7 @@
     {
       "name": "`new Function()` and `Function()`",
       "description": "With the `Function` constructor one can dynamically create a `Function` object.",
-      "path": "Function-constructor/new.js",
+      "path": "Function-constructor/new",
       "level": "INTERMEDIATE",
       "requiresKnowledgeFrom": [],
       "links": [
@@ -412,7 +412,7 @@
     {
       "name": "`Function.length`",
       "description": "The `length` property of the `Function` constructor is always 1.",
-      "path": "Function-constructor/length.js",
+      "path": "Function-constructor/length",
       "level": "BEGINNER",
       "requiresKnowledgeFrom": [
         {
@@ -437,7 +437,7 @@
     {
       "name": "`Function.prototype`",
       "description": "The `prototype` property of the `Function` constructor is a `Function` object.",
-      "path": "Function-constructor/prototype.js",
+      "path": "Function-constructor/prototype",
       "level": "BEGINNER",
       "requiresKnowledgeFrom": [],
       "links": [
diff --git a/katas/es1/language/__grouped__.json b/katas/es1/language/__grouped__.json
index 7b052c3..d380d69 100644
--- a/katas/es1/language/__grouped__.json
+++ b/katas/es1/language/__grouped__.json
@@ -447,7 +447,7 @@
         {
           "name": "`new Function()` and `Function()`",
           "description": "With the `Function` constructor one can dynamically create a `Function` object.",
-          "path": "Function-constructor/new.js",
+          "path": "Function-constructor/new",
           "level": "INTERMEDIATE",
           "requiresKnowledgeFrom": [],
           "links": [
@@ -474,7 +474,7 @@
         {
           "name": "`Function.length`",
           "description": "The `length` property of the `Function` constructor is always 1.",
-          "path": "Function-constructor/length.js",
+          "path": "Function-constructor/length",
           "level": "BEGINNER",
           "requiresKnowledgeFrom": [
             {
@@ -498,7 +498,7 @@
         {
           "name": "`Function.prototype`",
           "description": "The `prototype` property of the `Function` constructor is a `Function` object.",
-          "path": "Function-constructor/prototype.js",
+          "path": "Function-constructor/prototype",
           "level": "BEGINNER",
           "requiresKnowledgeFrom": [],
           "links": [