diff --git a/src/hardware/hw_main.c b/src/hardware/hw_main.c
index 397ef637..15a30764 100644
--- a/src/hardware/hw_main.c
+++ b/src/hardware/hw_main.c
@@ -3019,11 +3019,24 @@ static void HWR_RotateSpritePolyToAim(gr_vissprite_t *spr, FOutVector *wallVerts
 {
 	if (cv_grspritebillboarding.value && spr && spr->mobj && !(spr->mobj->frame & FF_PAPERSPRITE) && wallVerts)
 	{
-		float basey = FIXED_TO_FLOAT(spr->mobj->z);
+		// uncapped/interpolation
+		interpmobjstate_t interp = {0};
+
+		// do interpolation
+		if (R_UsingFrameInterpolation() && !paused)
+		{
+			R_InterpolateMobjState(spr->mobj, rendertimefrac, &interp);
+		}
+		else
+		{
+			R_InterpolateMobjState(spr->mobj, FRACUNIT, &interp);
+		}
+
+		float basey = FIXED_TO_FLOAT(interp.z);
 		float lowy = wallVerts[0].y;
 		if (P_MobjFlip(spr->mobj) == -1)
 		{
-			basey = FIXED_TO_FLOAT(spr->mobj->z + spr->mobj->height);
+			basey = FIXED_TO_FLOAT(interp.z + spr->mobj->height);
 		}
 		// Rotate sprites to fully billboard with the camera
 		// X, Y, AND Z need to be manipulated for the polys to rotate around the