diff --git a/boards/default_src/python/blocks/variables.js b/boards/default_src/python/blocks/variables.js
index bf3921f2..edc892ef 100644
--- a/boards/default_src/python/blocks/variables.js
+++ b/boards/default_src/python/blocks/variables.js
@@ -214,18 +214,15 @@ export const lists_zip = {
         this.setMutator(new Blockly.icons.MutatorIcon(['lists_zip_item'], this));
         this.setTooltip(Blockly.Msg.MIXLY_PYTHON_LISTS_ZIP_TOOLTIP);
     },
-
     mutationToDom: function () {
         var container = document.createElement('mutation');
         container.setAttribute('items', this.itemCount_);
         return container;
     },
-
     domToMutation: function (xmlElement) {
         this.itemCount_ = parseInt(xmlElement.getAttribute('items'), 10);
         this.updateShape_();
     },
-
     decompose: function (workspace) {
         var containerBlock =
             workspace.newBlock('lists_zip_container');
@@ -239,7 +236,6 @@ export const lists_zip = {
         }
         return containerBlock;
     },
-
     compose: function (containerBlock) {
         var itemBlock = containerBlock.getInputTargetBlock('STACK');
         // Count number of inputs.
@@ -260,7 +256,6 @@ export const lists_zip = {
             }
         }
     },
-
     saveConnections: function (containerBlock) {
         var itemBlock = containerBlock.getInputTargetBlock('STACK');
         var i = 0;
@@ -272,7 +267,6 @@ export const lists_zip = {
                 itemBlock.nextConnection.targetBlock();
         }
     },
-
     updateShape_: function () {
         // Delete everything.
         if (this.getInput('EMPTY')) {
diff --git a/boards/default_src/python/others/names.js b/boards/default_src/python/others/names.js
index 42bfa361..376c96f0 100644
--- a/boards/default_src/python/others/names.js
+++ b/boards/default_src/python/others/names.js
@@ -117,7 +117,7 @@ class Names {
                 name = varName;
             }
         }
-        var normalized = name.toLowerCase() + '_' + type;
+        var normalized = name + '_' + type;
 
         var isVarType = type == Variables.NAME_TYPE ||
             type == Names.DEVELOPER_VARIABLE_TYPE;
diff --git a/boards/default_src/python/others/variables.js b/boards/default_src/python/others/variables.js
index a9f8bf99..6fbc6c4a 100644
--- a/boards/default_src/python/others/variables.js
+++ b/boards/default_src/python/others/variables.js
@@ -56,7 +56,7 @@ Variables.allVariables = function (root) {
             var varName = blockVariables[y];
             // Variable name may be null if the block is only half-built.
             if (varName) {
-                variableHash[varName.toLowerCase()] = varName;
+                variableHash[varName] = varName;
             }
         }
     }
@@ -215,7 +215,7 @@ Variables.generateUniqueName = function (workspace) {
         while (!newName) {
             var inUse = false;
             for (var i = 0; i < variableList.length; i++) {
-                if (variableList[i].toLowerCase() == potName) {
+                if (variableList[i] == potName) {
                     // This potential name is already used.
                     inUse = true;
                     break;