diff --git a/src/Web/UIEvent/MouseEvent.js b/src/Web/UIEvent/MouseEvent.js
index 120b47d..12db2bc 100644
--- a/src/Web/UIEvent/MouseEvent.js
+++ b/src/Web/UIEvent/MouseEvent.js
@@ -16,6 +16,14 @@ exports.clientY = function (e) {
   return e.clientY;
 };
 
+exports.offsetX = function (e) {
+  return e.offsetX;
+};
+
+exports.offsetY = function (e) {
+  return e.offsetY;
+};
+
 exports.pageX = function (e) {
   return e.pageX;
 };
diff --git a/src/Web/UIEvent/MouseEvent.purs b/src/Web/UIEvent/MouseEvent.purs
index 244efd9..3fd235f 100644
--- a/src/Web/UIEvent/MouseEvent.purs
+++ b/src/Web/UIEvent/MouseEvent.purs
@@ -49,6 +49,10 @@ foreign import screenX :: MouseEvent -> Int
 
 foreign import screenY :: MouseEvent -> Int
 
+foreign import offsetX :: MouseEvent -> Int
+
+foreign import offsetY :: MouseEvent -> Int
+
 foreign import clientX :: MouseEvent -> Int
 
 foreign import clientY :: MouseEvent -> Int