diff --git a/core/field_image.js b/core/field_image.js
index e5177e63e..ede3e2b92 100644
--- a/core/field_image.js
+++ b/core/field_image.js
@@ -38,11 +38,11 @@ goog.require('goog.userAgent');
  * @param {number} width Width of the image.
  * @param {number} height Height of the image.
  * @param {string=} opt_alt Optional alt text for when block is collapsed.
- * @param {function=} opt_onclick Optional function to be called when image is clicked
+ * @param {function=} opt_onClick Optional function to be called when image is clicked
  * @extends {Blockly.Field}
  * @constructor
  */
-Blockly.FieldImage = function(src, width, height, opt_alt, opt_onclick) {
+Blockly.FieldImage = function(src, width, height, opt_alt, opt_onClick) {
   this.sourceBlock_ = null;
 
   // Ensure height and width are numbers.  Strings are bad at math.
@@ -53,10 +53,9 @@ Blockly.FieldImage = function(src, width, height, opt_alt, opt_onclick) {
   this.text_ = opt_alt || '';
   this.setValue(src);
 
-  if(typeof opt_onclick === "function"){
-    this.clickHandler_ = opt_onclick;
+  if (typeof opt_onClick === "function") {
+    this.clickHandler_ = opt_onClick;
   }
-
 };
 goog.inherits(Blockly.FieldImage, Blockly.Field);
 
@@ -171,10 +170,9 @@ Blockly.FieldImage.prototype.updateWidth = function() {
 /**
  * If field click is called, and click handler defined,
  * call the handler.
- * @private
  */
- Blockly.FieldImage.prototype.showEditor = function(){
-   if(typeof this.clickHandler_ === "function"){
+ Blockly.FieldImage.prototype.showEditor = function() {
+   if (this.clickHandler_){
      this.clickHandler_(this);
    }
- }
+ };