diff --git a/calendar/js/app.js b/calendar/js/app.js
index 7dc2bdf356..f563e1e2fd 100644
--- a/calendar/js/app.js
+++ b/calendar/js/app.js
@@ -147,8 +147,9 @@ app.classes.calendar = AppJS.extend(
 					var dataResize = resizeHelper.split("|");
 					var time = dataResize[1].split(":");
 					var dropDate = dataResize[0]+"T"+time[0]+time[1];
+					var calOwner = this.getAttribute('id').substring(this.getAttribute('id').lastIndexOf("_O")+2,this.getAttribute('id').lastIndexOf("_C"));
 
-					var drop = jQuery("div[id^='drop_"+dropDate+"']");
+					var drop = jQuery("div[id^='drop_"+dropDate+"_O"+calOwner+"']");
 					var newDuration = Math.round(this.clientHeight/drop[0].clientHeight)*  parseInt(dataResize[2]) * 60;
 					that.dropEvent(this.getAttribute('id'),dropDate,newDuration);
 				},