diff --git a/src/core.js b/src/core.js
index db988a9b5c..7a77ae1327 100644
--- a/src/core.js
+++ b/src/core.js
@@ -46,11 +46,11 @@ var jQuery = function( selector, context ) {
 	rmozilla = /(mozilla)(?:.*? rv:([\w.]+))?/,
 
 	// Matches dashed string for camelizing
-	rdashAlpha = /-([a-z])/ig,
+	rdashAlpha = /-([a-z]|[0-9])/ig,
 
 	// Used by jQuery.camelCase as callback to replace()
 	fcamelCase = function( all, letter ) {
-		return letter.toUpperCase();
+		return ( letter + "" ).toUpperCase();
 	},
 
 	// Keep a UserAgent string for use with jQuery.browser