diff --git a/touch-dnd.js b/touch-dnd.js
index 35f4aaa..58470ab 100644
--- a/touch-dnd.js
+++ b/touch-dnd.js
@@ -612,8 +612,8 @@
     }
 
     if (this.opts.forcePlaceholderSize) {
-      this.placeholder.height(dragging.el.height())
-      this.placeholder.width(dragging.el.width())
+      this.placeholder.height(parseFloat(dragging.el.css('height')))
+      this.placeholder.width(parseFloat(dragging.el.css('width')))
     }
 
     dragging.adjustPlacement(e)
@@ -643,8 +643,8 @@
     dragging.placeholder = this.placeholder
 
     if (this.opts.forcePlaceholderSize) {
-      this.placeholder.height(dragging.el.height())
-      this.placeholder.width(dragging.el.width())
+      this.placeholder.height(parseFloat(dragging.el.css('height')))
+      this.placeholder.width(parseFloat(dragging.el.css('width')))
     }
 
     if (!isContainer) {
@@ -831,4 +831,4 @@
     items: 'li, div',
     placeholder: 'placeholder'
   })
-}(window.Zepto || window.jQuery)
\ No newline at end of file
+}(window.Zepto || window.jQuery)