diff --git a/clientside_validation.js b/clientside_validation.js
index aca6cc8..81ba956 100644
--- a/clientside_validation.js
+++ b/clientside_validation.js
@@ -1261,7 +1261,7 @@
         });
       });
       return ret;
-    }, jQuery.format('Please fill in at least on of the fields'));
+    }, jQuery.format('Please fill in at least one of the fields'));
 
     // Support for phone
     jQuery.validator.addMethod("phone", function(value, element, param) {