diff --git a/gui.js b/gui.js
index 5bccd6de..6770465b 100644
--- a/gui.js
+++ b/gui.js
@@ -5374,6 +5374,7 @@ SpriteIconMorph.prototype.copyStack = function (block) {
 
 SpriteIconMorph.prototype.copyCostume = function (costume) {
     var dup = costume.copy();
+    dup.name = this.object.newCostumeName(dup.name);
     this.object.addCostume(dup);
     this.object.wearCostume(dup);
 };
diff --git a/history.txt b/history.txt
index 236ba8a4..29e3586c 100755
--- a/history.txt
+++ b/history.txt
@@ -2208,4 +2208,4 @@ ______
 140718
 ------
 * Lists: incorporate Brian’s adhoc fixes, thanks, Brian!
-* GUI: Use new mechanism for unique costume names on the paint editor, renamed costumes
+* GUI: Use new mechanism for unique costume names on the paint editor, renamed costumes and costumes dragged and dropped onto sprite icons