diff --git a/clamp.js b/clamp.js
index f13e8ad..8770ecc 100644
--- a/clamp.js
+++ b/clamp.js
@@ -241,7 +241,7 @@
             sty.webkitLineClamp = clampValue;
 
             if (isCSSValue) {
-                sty.height = opt.clamp + 'px';
+                sty.height = opt.clamp;
             }
         }
         else {
@@ -258,4 +258,4 @@
     }
 
     window.$clamp = clamp;
-})();
\ No newline at end of file
+})();