diff --git a/source/games/sw/src/weapon.cpp b/source/games/sw/src/weapon.cpp
index bf642abcc..6587b26a4 100644
--- a/source/games/sw/src/weapon.cpp
+++ b/source/games/sw/src/weapon.cpp
@@ -13651,7 +13651,7 @@ int InitRocket(PLAYER* pp)
     SetOwner(pp->actor, actorNew);
     actorNew->spr.scale = DVector2(1.40626, 1.40625);
     actorNew->spr.shade = -15;
-    zvel = pp->horizon.horiz.Tan() * ((HORIZ_MULT + 35) * 0.5);
+    setFreeAimVelocity(actorNew->vel.X, zvel, pp->horizon.horiz, (HORIZ_MULT + 35) * 0.5);
 
     actorNew->clipdist = 4;