diff --git a/src/hardware/hw_main.c b/src/hardware/hw_main.c
index 8d2170435b189e69149b1eb5d3aa9d59388e4f58..4bf5ccb68b8a77f3db563690f2be9c5273e50339 100644
--- a/src/hardware/hw_main.c
+++ b/src/hardware/hw_main.c
@@ -3767,7 +3767,7 @@ static void HWR_RotateSpritePolyToAim(gl_vissprite_t *spr, FOutVector *wallVerts
 		{
 			if (precip)
 			{
-				R_InterpolatePrecipMobjState(spr->mobj, rendertimefrac, &interp);
+				R_InterpolatePrecipMobjState((precipmobj_t *)spr->mobj, rendertimefrac, &interp);
 			}
 			else
 			{
@@ -3778,7 +3778,7 @@ static void HWR_RotateSpritePolyToAim(gl_vissprite_t *spr, FOutVector *wallVerts
 		{
 			if (precip)
 			{
-				R_InterpolatePrecipMobjState(spr->mobj, FRACUNIT, &interp);
+				R_InterpolatePrecipMobjState((precipmobj_t *)spr->mobj, FRACUNIT, &interp);
 			}
 			else
 			{