diff --git a/src/platform/windows/Window.cpp b/src/platform/windows/Window.cpp
index cb46449..b9d6195 100644
--- a/src/platform/windows/Window.cpp
+++ b/src/platform/windows/Window.cpp
@@ -95,7 +95,7 @@ LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
                 int wheel_delta = GET_WHEEL_DELTA_WPARAM(wParam);
                 // Clamp to normalized range [+1 or -1].
                 // TODO: Test this and make sure sign is the same on both platforms for each direction.
-                wheel_delta = (wheel_delta > 0) : 1 ? -1;
+                wheel_delta = (wheel_delta > 0) ? 1 : -1;
                 // TODO: Determine sign of wheel_delta for each direction, (and on linux too), and document this.
                 window->processMouseWheel(wheel_delta);
                 break;