diff --git a/src/core.js b/src/core.js
index c90f58d8..924bf965 100644
--- a/src/core.js
+++ b/src/core.js
@@ -943,12 +943,12 @@ jQuery.extend({
 			context = context.ownerDocument || context[0] && context[0].ownerDocument || document;
 
 		jQuery.each(elems, function(i, elem){
+			if ( typeof elem == 'number' )
+				elem += '';
+
 			if ( !elem )
 				return;
 
-			if ( elem.constructor == Number )
-				elem += '';
-
 			// Convert html string into DOM nodes
 			if ( typeof elem == "string" ) {
 				// Fix "XHTML"-style tags in all browsers
@@ -1368,4 +1368,4 @@ jQuery.each([ "Height", "Width" ], function(i, name){
 // Helper function used by the dimensions and offset modules
 function num(elem, prop) {
 	return elem[0] && parseInt( jQuery.curCSS(elem[0], prop, true), 10 ) || 0;
-}
\ No newline at end of file
+}