diff --git a/src/r_plane.c b/src/r_plane.c
index f4fd9c397..c54b32382 100644
--- a/src/r_plane.c
+++ b/src/r_plane.c
@@ -759,7 +759,7 @@ d->z = (v1.x * v2.y) - (v1.y * v2.x)
 #undef SFMULT
 }
 
-static void R_SetSlopePlaneVectors(visplane_t *pl, INT32 y, fixed_t xoff, fixed_t yoff, float fudge)
+void R_SetTiltedSpan(INT32 span)
 {
 	if (ds_su == NULL)
 		ds_su = Z_Malloc(sizeof(*ds_su) * vid.height, PU_STATIC, NULL);
@@ -768,10 +768,14 @@ static void R_SetSlopePlaneVectors(visplane_t *pl, INT32 y, fixed_t xoff, fixed_
 	if (ds_sz == NULL)
 		ds_sz = Z_Malloc(sizeof(*ds_sz) * vid.height, PU_STATIC, NULL);
 
-	ds_sup = &ds_su[y];
-	ds_svp = &ds_sv[y];
-	ds_szp = &ds_sz[y];
+	ds_sup = &ds_su[span];
+	ds_svp = &ds_sv[span];
+	ds_szp = &ds_sz[span];
+}
 
+static void R_SetSlopePlaneVectors(visplane_t *pl, INT32 y, fixed_t xoff, fixed_t yoff, float fudge)
+{
+	R_SetTiltedSpan(y);
 	R_CalculateSlopeVectors(pl->slope, pl->viewx, pl->viewy, pl->viewz, FRACUNIT, FRACUNIT, xoff, yoff, pl->viewangle, pl->plangle, fudge);
 }
 
diff --git a/src/r_plane.h b/src/r_plane.h
index 7664858c9..0d11c5b72 100644
--- a/src/r_plane.h
+++ b/src/r_plane.h
@@ -96,6 +96,9 @@ void R_DrawSinglePlane(visplane_t *pl);
 // Calculates the slope vectors needed for tilted span drawing.
 void R_CalculateSlopeVectors(pslope_t *slope, fixed_t planeviewx, fixed_t planeviewy, fixed_t planeviewz, fixed_t planexscale, fixed_t planeyscale, fixed_t planexoffset, fixed_t planeyoffset, angle_t planeviewangle, angle_t planeangle, float fudge);
 
+// Sets the slope vector pointers for the current tilted span.
+void R_SetTiltedSpan(INT32 span);
+
 typedef struct planemgr_s
 {
 	visplane_t *plane;
diff --git a/src/r_splats.c b/src/r_splats.c
index 636aa30ed..a3fad82d8 100644
--- a/src/r_splats.c
+++ b/src/r_splats.c
@@ -419,9 +419,7 @@ void R_RenderFloorSplat(floorsplat_t *pSplat, vector2_t *verts, vissprite_t *vis
 	// Lactozilla: I don't know what I'm doing
 	if (pSplat->tilted)
 	{
-		ds_sup = &ds_su[0];
-		ds_svp = &ds_sv[0];
-		ds_szp = &ds_sz[0];
+		R_SetTiltedSpan(0);
 		R_CalculateSlopeVectors(&pSplat->slope, viewx, viewy, viewz, pSplat->xscale, pSplat->yscale, -pSplat->verts[0].x, pSplat->verts[0].y, viewangle, pSplat->angle, 1.0f);
 		spanfunctype = SPANDRAWFUNC_TILTEDSPRITE;
 	}