diff --git a/src/React.js b/src/React.js
index 451f8dd..3ddab7c 100644
--- a/src/React.js
+++ b/src/React.js
@@ -187,11 +187,15 @@ function createFactory(class_) {
 exports.createFactory = createFactory;
 
 function preventDefault(event) {
-  return function() { return event.preventDefault();}
+  return function() {
+    event.preventDefault();
+  };
 };
 exports.preventDefault = preventDefault;
 
 function stopPropagation(event) {
-  return function() { return event.stopPropagation();}
+  return function() {
+    event.stopPropagation();
+  };
 };
 exports.stopPropagation = stopPropagation;
diff --git a/src/React.purs b/src/React.purs
index 9a4f927..a343c10 100644
--- a/src/React.purs
+++ b/src/React.purs
@@ -418,6 +418,6 @@ foreign import data Children :: Type
 -- | Internal conversion function from children elements to an array of React elements
 foreign import childrenToArray :: Children -> Array ReactElement
 
-foreign import preventDefault :: forall eff a. Event -> Eff eff a
+foreign import preventDefault :: forall eff. Event -> Eff eff Unit
 
-foreign import stopPropagation :: forall eff a. Event -> Eff eff a
+foreign import stopPropagation :: forall eff. Event -> Eff eff Unit