diff --git a/src/osdep/dos/dos.c b/src/osdep/dos/dos.c
index e2bbce008..bdb97f92c 100644
--- a/src/osdep/dos/dos.c
+++ b/src/osdep/dos/dos.c
@@ -378,6 +378,7 @@ static void dos_mouse_poll(void)
 {
 	int i;
 	int cx, cy;
+	char bb;
 	__dpmi_regs r;
 	dos_poll_break();
 	if (dos_mouse_initialized) {
@@ -419,8 +420,13 @@ px:
 		memset(&r, 0, sizeof r);
 		r.x.ax = 3;
 		__dpmi_int(0x33, &r);
+		bb = r.x.bx >> 8;
 		cx = dos_mouse_coord(r.x.cx);
 		cy = dos_mouse_coord(r.x.dx);
+		if (bb) {
+			dos_mouse_enqueue(cx, cy, bb < 0 ? (B_DOWN | B_WHEEL_UP) : (B_DOWN | B_WHEEL_DOWN));
+			goto x;
+		}
 		if (cx != dos_mouse_last_x || cy != dos_mouse_last_y) {
 			for (i = 0; i < dos_mouse_buttons; i++)
 				if (dos_mouse_last_button & (1 << i)) {