diff --git a/src/macos.m b/src/macos.m

index ad236784..191842f6 100644

--- a/src/macos.m

+++ b/src/macos.m

@@ -436,6 +436,10 @@ static iBool processScrollWheelEvent_(NSEvent *event) {

 const iBool isInertia  = (event.momentumPhase & (NSEventPhaseBegan | NSEventPhaseChanged)) != 0;

 const iBool isEnded    = event.scrollingDeltaX == 0.0f && event.scrollingDeltaY == 0.0f && !isInertia;

 const iWindow *win     = &get_MainWindow()->base;

+ if (event.window != nsWindow_(win->win)) {

+ /* Not the main window. */

+ return iFalse;

+ }

 if (isPerPixel) {

     /* On macOS 12.1, stopping ongoing inertia scroll with a tap seems to sometimes produce

        spurious large scroll events. */

@@ -525,7 +529,6 @@ static iBool processScrollWheelEvent_(NSEvent *event) {

         ev.wheel.y = iSign(ev.wheel.y);

     }

#endif

- 

 return iTrue;        

}