diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2eb312ca..3658c23d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -27,6 +27,7 @@
 - On NetBSD, fixed crash due to incorrect detection of the main thread.
 - **Breaking:** The virtual key code `Subtract` has been renamed to `NumpadSubtract`
 - **Breaking:** On X11, `-` key is mapped to the `Minus` virtual key code, instead of `Subtract`
+- On macOS, fix inverted horizontal scroll.
 
 # 0.22.2 (2020-05-16)
 
diff --git a/src/platform_impl/macos/view.rs b/src/platform_impl/macos/view.rs
index 35751500..2c379e0a 100644
--- a/src/platform_impl/macos/view.rs
+++ b/src/platform_impl/macos/view.rs
@@ -1003,7 +1003,8 @@ extern "C" fn scroll_wheel(this: &Object, _sel: Sel, event: id) {
         let state = &mut *(state_ptr as *mut ViewState);
 
         let delta = {
-            let (x, y) = (event.scrollingDeltaX(), event.scrollingDeltaY());
+            // macOS horizontal sign convention is the inverse of winit.
+            let (x, y) = (event.scrollingDeltaX() * -1.0, event.scrollingDeltaY());
             if event.hasPreciseScrollingDeltas() == YES {
                 let delta = LogicalPosition::new(x, y).to_physical(state.get_scale_factor());
                 MouseScrollDelta::PixelDelta(delta)