diff --git a/packages/babel-plugin-flow-runtime/src/__tests__/__fixtures__/bugs/2-implicit-function-return-after-statement.js b/packages/babel-plugin-flow-runtime/src/__tests__/__fixtures__/bugs/2-implicit-function-return-after-statement.js
new file mode 100644
index 0000000..f85830d
--- /dev/null
+++ b/packages/babel-plugin-flow-runtime/src/__tests__/__fixtures__/bugs/2-implicit-function-return-after-statement.js
@@ -0,0 +1,18 @@
+/* @flow */
+
+export const input = `
+function testFunction() : string {
+  const value = "hello";
+}
+`;
+
+export const expected = `
+import t from "flow-runtime";
+
+function testFunction() {
+  const _returnType = t.return(t.string());
+
+  const value = "hello";
+  return _returnType.assert();
+}
+`;
diff --git a/packages/babel-plugin-flow-runtime/src/transformVisitors.js b/packages/babel-plugin-flow-runtime/src/transformVisitors.js
index e88d0f7..f1e062e 100644
--- a/packages/babel-plugin-flow-runtime/src/transformVisitors.js
+++ b/packages/babel-plugin-flow-runtime/src/transformVisitors.js
@@ -504,7 +504,7 @@ export default function transformVisitors (context: ConversionContext): Object {
             if (body.node.body
               // do not add if last statement is return one
               && (body.node.body.length === 0
-                || !body.node.body[ body.node.body.length - 1].type === "ReturnStatement")
+                || body.node.body[body.node.body.length - 1].type !== 'ReturnStatement')
             ) {
               // we do not add arguments here
               // only "return;"