diff --git a/prboom2/src/SDL/i_video.c b/prboom2/src/SDL/i_video.c
index 3bc42cd09..2ff45bcef 100644
--- a/prboom2/src/SDL/i_video.c
+++ b/prboom2/src/SDL/i_video.c
@@ -303,14 +303,14 @@ while (SDL_PollEvent(Event))
     {
       event.type = ev_keydown;
       event.data1 = KEYD_MWHEELUP;
-      mwheeldowntic = gametic;
+      mwheeluptic = gametic;
       D_PostEvent(&event);
     }
     else if (Event->wheel.y < 0)
     {
       event.type = ev_keydown;
       event.data1 = KEYD_MWHEELDOWN;
-      mwheeluptic = gametic;
+      mwheeldowntic = gametic;
       D_PostEvent(&event);
     }
   }