diff --git a/core/variables.js b/core/variables.js
index fe66eafc6..aa8a29fe4 100644
--- a/core/variables.js
+++ b/core/variables.js
@@ -91,6 +91,12 @@ Blockly.Variables.allUsedVariables = function() {
       'issue please file a bug on GitHub.');
 };
 
+/**
+ * @private
+ * @type {Object<string,boolean>}
+ */
+Blockly.Variables.ALL_DEVELOPER_VARS_WARNINGS_BY_BLOCK_TYPE_ = {};
+
 /**
  * Find all developer variables used by blocks in the workspace.
  * Developer variables are never shown to the user, but are declared as global
@@ -106,8 +112,21 @@ Blockly.Variables.allDeveloperVariables = function(workspace) {
   var hash = {};
   for (var i = 0; i < blocks.length; i++) {
     var block = blocks[i];
-    if (block.getDeveloperVars) {
-      var devVars = block.getDeveloperVars();
+    var getDeveloperVariables = block.getDeveloperVariables;
+    if (!getDeveloperVariables && block.getDeveloperVars) {
+      // August 2018: getDeveloperVars() was deprecated and renamed
+      // getDeveloperVariables().
+      getDeveloperVariables = block.getDeveloperVars;
+      if (!Blockly.Variables.ALL_DEVELOPER_VARS_WARNINGS_BY_BLOCK_TYPE_[
+          block.type]) {
+        console.warn('Function getDeveloperVars() deprecated. Use ' +
+          'getDeveloperVariables() (block type \'' + block.type + '\')');
+        Blockly.Variables.ALL_DEVELOPER_VARS_WARNINGS_BY_BLOCK_TYPE_[
+            block.type] = true;
+      }
+    }
+    if (getDeveloperVariables) {
+      var devVars = getDeveloperVariables();
       for (var j = 0; j < devVars.length; j++) {
         hash[devVars[j]] = devVars[j];
       }