diff --git a/core/inject.js b/core/inject.js
index d299d9997..4ef336f5e 100644
--- a/core/inject.js
+++ b/core/inject.js
@@ -311,7 +311,7 @@ Blockly.createMainWorkspace_ = function(svg, options, blockDragSurface,
           }
           if (e) {
             if (!e.group && object) {
-              console.log('WARNING: Moved object in bounds but there was no' +
+              console.warn('Moved object in bounds but there was no' +
                   ' event group. This may break undo.');
             }
             if (oldGroup !== null) {
diff --git a/core/utils.js b/core/utils.js
index 4bbffdca5..fa7e42698 100644
--- a/core/utils.js
+++ b/core/utils.js
@@ -250,7 +250,7 @@ Blockly.utils.checkMessageReferences = function(message) {
   for (var i = 0; i < m.length; i++) {
     var msgKey = m[i].toUpperCase();
     if (msgTable[msgKey.slice(6, -1)] == undefined) {
-      console.log('WARNING: No message string for ' + m[i] + ' in ' + message);
+      console.warn('No message string for ' + m[i] + ' in ' + message);
       validSoFar = false;  // Continue to report other errors.
     }
   }