diff --git a/Makefile b/Makefile
index fd0b755..be2ecb7 100644
--- a/Makefile
+++ b/Makefile
@@ -23,7 +23,7 @@ fixme:
 	ack -l FIXME *.go
 
 otto:
-	$(MAKE) -C otto 
+	$(MAKE) -C otto
 
 run:
 	go run -a ./otto/main.go ./otto.js
diff --git a/evaluate.go b/evaluate.go
index 9f53368..f6239e8 100644
--- a/evaluate.go
+++ b/evaluate.go
@@ -49,7 +49,7 @@ func (self *_runtime) evaluate(node _node) Value {
 		return self.evaluateBody(node.Body)
 
 	case *_blockNode:
-		return self.evaluateBody(node.Body)
+		return self.evaluateBlock(node)
 
 	case *_valueNode:
 		return self.evaluateValue(node)
diff --git a/evaluate_statement.go b/evaluate_statement.go
index aa3747c..2c77c0c 100644
--- a/evaluate_statement.go
+++ b/evaluate_statement.go
@@ -104,6 +104,16 @@ func (self *_runtime) evaluateWith(node *_withNode) Value {
 	return self.evaluate(node.Body)
 }
 
+func (self *_runtime) evaluateBlock(node *_blockNode) Value {
+
+	body := node.Body
+	_labelSet := node._labelSet
+
+	return self.breakEvaluate(_labelSet, func() Value {
+		return self.evaluateBody(body)
+	})
+}
+
 func (self *_runtime) evaluateDoWhile(node *_doWhileNode) Value {
 
 	test := node.Test
diff --git a/node_statement.go b/node_statement.go
index 86d7379..0372463 100644
--- a/node_statement.go
+++ b/node_statement.go
@@ -7,12 +7,14 @@ import (
 type _blockNode struct {
 	_nodeType
 	_node_
-	Body []_node
+	Body      []_node
+	_labelSet _labelSet
 }
 
 func newBlockNode() *_blockNode {
 	return &_blockNode{
 		_nodeType: nodeBlock,
+		_labelSet: _labelSet{},
 	}
 }
 
diff --git a/parse_statement.go b/parse_statement.go
index f32c047..0ed6e18 100644
--- a/parse_statement.go
+++ b/parse_statement.go
@@ -58,6 +58,8 @@ func (self *_parser) ParseStatement() _node {
 		{
 			_labelSet = nil
 			switch node := statement.(type) {
+			case *_blockNode:
+				_labelSet = node._labelSet
 			case *_doWhileNode:
 				_labelSet = node._labelSet
 			case *_whileNode:
diff --git a/runtime_test.go b/runtime_test.go
index f9ae903..b546c1a 100644
--- a/runtime_test.go
+++ b/runtime_test.go
@@ -1130,6 +1130,27 @@ func TestNewPrototype(t *testing.T) {
 	`, "Nothing happens.")
 }
 
+func TestBlock(t *testing.T) {
+	Terst(t)
+
+	test := runTest()
+
+	test(`
+        var abc=0;
+        var ghi;
+        def: {
+            do {
+                abc++;
+                if (!(abc < 10)) {
+                    break def;
+                    ghi = "ghi";
+                }
+            } while (true);
+        }
+        [ abc,ghi ];
+    `, "10,")
+}
+
 func TestWith(t *testing.T) {
 	Terst(t)