diff --git a/src/internal/ButtonBase.js b/src/internal/ButtonBase.js
index b46a61378fad6c..d94006a411ed89 100644
--- a/src/internal/ButtonBase.js
+++ b/src/internal/ButtonBase.js
@@ -196,6 +196,7 @@ class ButtonBase extends Component<DefaultProps, Props, State> {
   });
 
   handleTouchStart = createRippleHandler(this, 'TouchStart', 'start');
+
   handleTouchEnd = createRippleHandler(this, 'TouchEnd', 'stop');
 
   handleBlur = createRippleHandler(this, 'Blur', 'stop', () => {
diff --git a/src/internal/createRippleHandler.js b/src/internal/createRippleHandler.js
index c84dc5d21d9bf4..54bccad01faf3c 100644
--- a/src/internal/createRippleHandler.js
+++ b/src/internal/createRippleHandler.js
@@ -1,7 +1,7 @@
-// @flow weak
+// @flow
 
-export default function createRippleHandler(instance, eventName, action, cb) {
-  return function handleEvent(event) {
+function createRippleHandler(instance: Object, eventName: string, action: string, cb: ?Function) {
+  return function handleEvent(event: SyntheticUIEvent) {
     if (cb) {
       cb.call(instance, event);
     }
@@ -21,3 +21,5 @@ export default function createRippleHandler(instance, eventName, action, cb) {
     return true;
   };
 }
+
+export default createRippleHandler;