diff --git a/ExampleProject/components/Hello.tsx b/ExampleProject/components/Hello.tsx
index cc01cb5..d871c62 100644
--- a/ExampleProject/components/Hello.tsx
+++ b/ExampleProject/components/Hello.tsx
@@ -23,8 +23,8 @@ export class Hello extends React.Component<Props, State> {
     }
   }
 
-  onIncrement = () => this.setState({ enthusiasmLevel: this.state.enthusiasmLevel + 1 });
-  onDecrement = () => this.setState({ enthusiasmLevel: this.state.enthusiasmLevel - 1 });
+  onIncrement = () => this.setState(prevState => ({ enthusiasmLevel: prevState.enthusiasmLevel + 1 }));
+  onDecrement = () => this.setState(prevState => ({ enthusiasmLevel: prevState.enthusiasmLevel - 1 }));
   getExclamationMarks = (numChars: number) => Array(numChars + 1).join("!")
 
   render() {
diff --git a/README.md b/README.md
index a4d9d67..4ff45f9 100644
--- a/README.md
+++ b/README.md
@@ -190,8 +190,8 @@ export class Hello extends React.Component<Props, State> {
     }
   }
 
-  onIncrement = () => this.setState({ enthusiasmLevel: this.state.enthusiasmLevel + 1 });
-  onDecrement = () => this.setState({ enthusiasmLevel: this.state.enthusiasmLevel - 1 });
+  onIncrement = () => this.setState(prevState => ({ enthusiasmLevel: prevState.enthusiasmLevel + 1 }));
+  onDecrement = () => this.setState(prevState => ({ enthusiasmLevel: prevState.enthusiasmLevel - 1 }));
   getExclamationMarks = (numChars: number) => Array(numChars + 1).join("!")
 
   render() {