diff --git a/lib/schemator.js b/lib/schemator.js
index ac4bda7..678b555 100644
--- a/lib/schemator.js
+++ b/lib/schemator.js
@@ -103,12 +103,12 @@ Schemator.prototype.run = function(obj, callback){
                     var value = dotty.get(obj, validation[0]);
                     var args = Array.isArray(validation[2]) ? validation[2] : [validation[2]];
 
-                    context.key = validation[0];
+                    var contextCopy = Object.assign({}, context, {key: validation[0]});
 
                     if(!func)
                         return callback(new Error('Unknown validation method ' + validation[1]));
 
-                    func.call(context, value, args, function(err, inv, override){
+                    func.call(contextCopy, value, args, function(err, inv, override){
                         if(err)
                             return callback(err);
 
@@ -133,7 +133,7 @@ Schemator.prototype.run = function(obj, callback){
                     var value = dotty.get(obj, flag[0]);
                     var flagger = flaggers[flag[1]] || that.custom.flagger[flag[1]];
                     var args = Array.isArray(flag[2]) ? flag[2] : [flag[2]];
-
+                    
                     context.key = flag[0];
 
                     if(!flagger)