diff --git a/core/block_dragger.js b/core/block_dragger.js
index 8dfac65421e..b9ce831becb 100644
--- a/core/block_dragger.js
+++ b/core/block_dragger.js
@@ -217,12 +217,12 @@ Blockly.BlockDragger.prototype.dragBlock = function(e, currentDragDeltaXY) {
   }
 
   this.draggedConnectionManager_.update(delta, this.dragTarget_);
-  var wouldDeleteBlock = this.draggedConnectionManager_.wouldDeleteBlock();
-  if (wouldDeleteBlock != this.wouldDeleteBlock_) {
+  var oldWouldDeleteBlock = this.wouldDeleteBlock_;
+  this.wouldDeleteBlock_ = this.draggedConnectionManager_.wouldDeleteBlock();
+  if (oldWouldDeleteBlock != this.wouldDeleteBlock_) {
     // Prevent unnecessary add/remove class calls.
     this.updateCursorDuringBlockDrag_();
   }
-  this.wouldDeleteBlock_ = wouldDeleteBlock;
 };
 
 /**
diff --git a/core/bubble_dragger.js b/core/bubble_dragger.js
index 734445622fa..fd4b67b0042 100644
--- a/core/bubble_dragger.js
+++ b/core/bubble_dragger.js
@@ -142,12 +142,12 @@ Blockly.BubbleDragger.prototype.dragBubble = function(e, currentDragDeltaXY) {
     this.dragTarget_ && this.dragTarget_.onDragEnter();
   }
 
-  var wouldDeleteBubble = this.shouldDelete_(this.dragTarget_);
-  if (wouldDeleteBubble != this.wouldDeleteBubble_) {
+  var oldWouldDeleteBubble = this.wouldDeleteBubble_;
+  this.wouldDeleteBubble_ = this.shouldDelete_(this.dragTarget_);
+  if (oldWouldDeleteBubble != this.wouldDeleteBubble_) {
     // Prevent unnecessary add/remove class calls.
     this.updateCursorDuringBubbleDrag_();
   }
-  this.wouldDeleteBubble_ = wouldDeleteBubble;
 };
 
 /**