diff --git a/12-component-refactor.html b/12-component-refactor.html
index be47318..a7c0bbe 100644
--- a/12-component-refactor.html
+++ b/12-component-refactor.html
@@ -94,7 +94,7 @@
     return { currentRoom: 0 };
   },
 
-  componentDidMount() {
+  componentDidMount: function() {
     var component = this;
     var props = this.props;
 
@@ -107,7 +107,7 @@
     }, 1000);
   },
 
-  componentWillUnmount() {
+  componentWillUnmount: function() {
     clearInterval(this.interval);
   },
 
@@ -147,4 +147,4 @@ <h3>Dynamic refactor</h3>
 );
 
 ReactDOM.render(reactElement, document.getElementById("app"));
-</script>
\ No newline at end of file
+</script>
diff --git a/16-advanced-integration.html b/16-advanced-integration.html
index 249e588..37245e8 100644
--- a/16-advanced-integration.html
+++ b/16-advanced-integration.html
@@ -56,7 +56,7 @@
   // is state for the library, other objects, listeners etc.
   // they could be stored on the component and should be
   // deleted to prevent memory leaks
-  componentWillUnmount() {}
+  componentWillUnmount: function() {}
 });
 
 // Now we can use the library as a component
@@ -139,4 +139,4 @@
     context.arc(d.x, d.y, 3, 0, 2 * Math.PI);
   }
 }
-</script>
\ No newline at end of file
+</script>