diff --git a/map/map.js b/map/map.js
index 52a8a2c19e5..7bfee4995e2 100644
--- a/map/map.js
+++ b/map/map.js
@@ -59,7 +59,14 @@ steal('can/util', 'can/util/bind','./bubble.js', 'can/construct', 'can/util/batc
 					//!steal-remove-end
 					for (var prop in this.prototype) {
 						// Non-functions are regular defaults.
-						if (prop !== "define" && typeof this.prototype[prop] !== "function") {
+						if (
+							prop !== "define" &&
+							prop !== "constructor" &&
+							(
+								typeof this.prototype[prop] !== "function" ||
+								this.prototype[prop].prototype instanceof can.Construct
+							)
+						) {
 							this.defaults[prop] = this.prototype[prop];
 						// Functions with an `isComputed` property are computes.
 						} else if (this.prototype[prop].isComputed) {
@@ -110,7 +117,7 @@ steal('can/util', 'can/util/bind','./bubble.js', 'can/construct', 'can/util/batc
 				// Parses attribute name into its parts.
 				attrParts: function (attr, keepKey) {
 					//Keep key intact
-					
+
 					if (keepKey ) {
 						return [attr];
 					}
@@ -186,7 +193,7 @@ steal('can/util', 'can/util/bind','./bubble.js', 'can/construct', 'can/util/batc
 						firstSerialize = false;
 					if(!serializeMap) {
 						firstSerialize = true;
-						// Serialize might call .attr() so we need to keep different map 
+						// Serialize might call .attr() so we need to keep different map
 						serializeMap = {
 							attr: {},
 							serialize: {}
@@ -254,7 +261,7 @@ steal('can/util', 'can/util/bind','./bubble.js', 'can/construct', 'can/util/batc
 				if(obj instanceof can.Map){
 					obj = obj.serialize();
 				}
-				
+
 				// `_data` is where we keep the properties.
 				this._data = {};
 				/**
@@ -316,11 +323,11 @@ steal('can/util', 'can/util/bind','./bubble.js', 'can/construct', 'can/util/batc
 					target: ev.target
 				}, [newVal, oldVal]);
 
-				
+
 			},
 			// Trigger a change event.
 			_triggerChange: function (attr, how, newVal, oldVal) {
-				// so this change can bubble ... a bubbling change triggers the 
+				// so this change can bubble ... a bubbling change triggers the
 				// _changes trigger
 				if(bubble.isBubbling(this, "change")) {
 					can.batch.trigger(this, {
@@ -330,7 +337,7 @@ steal('can/util', 'can/util/bind','./bubble.js', 'can/construct', 'can/util/batc
 				} else {
 					can.batch.trigger(this, attr, [newVal, oldVal]);
 				}
-				
+
 				if(how === "remove" || how === "add") {
 					can.batch.trigger(this, {
 						type: "__keys",
@@ -411,8 +418,8 @@ steal('can/util', 'can/util/bind','./bubble.js', 'can/construct', 'can/util/batc
 			_get: function (attr) {
 				attr = ""+attr;
 				var dotIndex = attr.indexOf('.');
-				
-				
+
+
 				// Handles the case of a key having a `.` in its name
 				// Otherwise we have to dig deeper into the Map to get the value.
 				if( dotIndex >= 0 ) {
@@ -474,9 +481,9 @@ steal('can/util', 'can/util/bind','./bubble.js', 'can/construct', 'can/util/batc
 				if(!keepKey && dotIndex >= 0){
 					var first = attr.substr(0, dotIndex),
 						second = attr.substr(dotIndex+1);
-						
+
 					current =  this._init ? undefined : this.__get( first );
-					
+
 					if( Map.helpers.isObservable(current) ) {
 						current._set(second, value);
 					} else {
diff --git a/map/map_test.js b/map/map_test.js
index e108e3e6897..34cda65ad61 100644
--- a/map/map_test.js
+++ b/map/map_test.js
@@ -175,7 +175,7 @@ steal("can/map", "can/compute", "can/test", "can/list", function(){
 
 		testMap.serialize();
 
-		
+
 
 		ok(can.inArray("cats", attributesRead ) !== -1 && can.inArray( "dogs", attributesRead ) !== -1, "map serialization triggered __reading on all attributes");
 		ok(readingTriggeredForKeys, "map serialization triggered __reading for __keys");
@@ -230,10 +230,10 @@ steal("can/map", "can/compute", "can/test", "can/list", function(){
 	test("serializing cycles", function(){
 		var map1 = new can.Map({name: "map1"});
 		var map2 = new can.Map({name: "map2"});
-		
+
 		map1.attr("map2", map2);
 		map2.attr("map1", map1);
-		
+
 		var res = map1.serialize();
 		equal(res.name, "map1");
 		equal(res.map2.name, "map2");
@@ -268,7 +268,7 @@ steal("can/map", "can/compute", "can/test", "can/list", function(){
 
 		data.attr('name', 'David');
 	});
-	
+
 	test("map passed to Map constructor (#1166)", function(){
 		var map = new can.Map({x: 1});
 		var res = new can.Map(map);
@@ -276,4 +276,16 @@ steal("can/map", "can/compute", "can/test", "can/list", function(){
 			x: 1
 		}, "has the same properties");
 	});
+
+	test("constructor passed to scope is threated as a property (#1261)", function(){
+		var Constructor = can.Construct.extend({});
+
+		var Map = can.Map.extend({
+		  Todo: Constructor
+		});
+
+		var m = new Map();
+
+		equal(m.attr("Todo"), Constructor);
+	});
 });