diff --git a/src/world/map_animation.c b/src/world/map_animation.c
index 282cad529c..b481cb0029 100644
--- a/src/world/map_animation.c
+++ b/src/world/map_animation.c
@@ -83,7 +83,7 @@ void map_animation_invalidate_all()
 			RCT2_GLOBAL(0x0138B580, uint16)--;
 			numAnimatedObjects--;
 			if (numAnimatedObjects > 0)
-				memmove(aobj, aobj + 1, numAnimatedObjects);
+				memmove(aobj, aobj + 1, numAnimatedObjects * sizeof(rct_map_animation));
 		} else {
 			numAnimatedObjects--;
 			aobj++;