diff --git a/static/js/graphing.js b/static/js/graphing.js
index 95d76d1b4..39adc9aa3 100644
--- a/static/js/graphing.js
+++ b/static/js/graphing.js
@@ -368,8 +368,8 @@ ImageHistoryTree.prototype.setTag_ = function(tagName) {
 
     // Update the state of each existing node to no longer be highlighted.
     if (this.currentImage_) {
-	var currentNode = imageByDBID[this.currentImage_.dbid];
-	this.markPath_(currentNode, false);
+      var currentNode = imageByDBID[this.currentImage_.dbid];
+      this.markPath_(currentNode, false);
     }
 
     // Find the new current image (if any).
@@ -379,8 +379,8 @@ ImageHistoryTree.prototype.setTag_ = function(tagName) {
 
     // Update the state of the new node path.
     if (this.currentImage_) {
-	var currentNode = imageByDBID[this.currentImage_.dbid];
-	this.markPath_(currentNode, true);
+      var currentNode = imageByDBID[this.currentImage_.dbid];
+      this.markPath_(currentNode, true);
     }
 
     // Ensure that the children are in the correct order.