diff --git a/core/field_number.js b/core/field_number.js
index cd773cb87..94cda5108 100644
--- a/core/field_number.js
+++ b/core/field_number.js
@@ -31,7 +31,7 @@ goog.require('goog.math');
 
 /**
  * Class for an editable number field.
- * @param {string} value The initial content of the field.
+ * @param {number|string} value The initial content of the field.
  * @param {number|string|undefined} opt_min Minimum value.
  * @param {number|string|undefined} opt_max Maximum value.
  * @param {number|string|undefined} opt_precision Precision for value.
@@ -68,7 +68,7 @@ Blockly.FieldNumber.prototype.setConstraints = function(min, max, precision) {
   this.min_ = isNaN(min) ? -Infinity : min;
   max = parseFloat(max);
   this.max_ = isNaN(max) ? Infinity : max;
-  this.setValue(this.callValidator(this.getValue));
+  this.setValue(this.callValidator(this.getValue()));
 };
 
 /**