diff --git a/src/r_poly.cpp b/src/r_poly.cpp
index e9edacae1..184498692 100644
--- a/src/r_poly.cpp
+++ b/src/r_poly.cpp
@@ -152,9 +152,9 @@ void RenderPolyBsp::RenderSubsector(subsector_t *sub)
 	for (AActor *thing = sub->sector->thinglist; thing != nullptr; thing = thing->snext)
 	{
 		if ((thing->renderflags & RF_SPRITETYPEMASK) == RF_WALLSPRITE)
-			AddWallSprite(thing);
+			AddWallSprite(thing, sub);
 		else
-			AddSprite(thing);
+			AddSprite(thing, sub);
 	}
 }
 
@@ -273,7 +273,7 @@ bool RenderPolyBsp::IsThingCulled(AActor *thing)
 	return false;
 }
 
-void RenderPolyBsp::AddSprite(AActor *thing)
+void RenderPolyBsp::AddSprite(AActor *thing, subsector_t *sub)
 {
 	if (IsThingCulled(thing))
 		return;
@@ -308,6 +308,20 @@ void RenderPolyBsp::AddSprite(AActor *thing)
 		{ pos.X + ViewSin * spriteHalfWidth, pos.Y - ViewCos * spriteHalfWidth }
 	};
 
+	// Is this sprite inside? (To do: clip the points)
+	for (int i = 0; i < 2; i++)
+	{
+		for (uint32_t i = 0; i < sub->numlines; i++)
+		{
+			seg_t *line = &sub->firstline[i];
+			double nx = line->v1->fY() - line->v2->fY();
+			double ny = line->v2->fX() - line->v1->fX();
+			double d = -(line->v1->fX() * nx + line->v1->fY() * ny);
+			if (pos.X * nx + pos.Y * ny + d > 0.0)
+				return;
+		}
+	}
+
 	//double depth = 1.0;
 	//visstyle_t visstyle = GetSpriteVisStyle(thing, depth);
 	// Rumor has it that AlterWeaponSprite needs to be called with visstyle passed in somewhere around here..
@@ -347,7 +361,7 @@ void RenderPolyBsp::AddSprite(AActor *thing)
 	TriangleDrawer::draw(worldToClip, vertices, 4, TriangleDrawMode::Fan, false, 0, viewwidth, cliptop, clipbottom, tex);
 }
 
-void RenderPolyBsp::AddWallSprite(AActor *thing)
+void RenderPolyBsp::AddWallSprite(AActor *thing, subsector_t *sub)
 {
 	if (IsThingCulled(thing))
 		return;
diff --git a/src/r_poly.h b/src/r_poly.h
index 1baaeddfb..cd1cd1215 100644
--- a/src/r_poly.h
+++ b/src/r_poly.h
@@ -62,8 +62,8 @@ private:
 	void AddLine(seg_t *line, sector_t *frontsector);
 	TriVertex PlaneVertex(vertex_t *v1, sector_t *sector, const secplane_t &plane);
 
-	void AddSprite(AActor *thing);
-	void AddWallSprite(AActor *thing);
+	void AddSprite(AActor *thing, subsector_t *sub);
+	void AddWallSprite(AActor *thing, subsector_t *sub);
 	bool IsThingCulled(AActor *thing);
 	visstyle_t GetSpriteVisStyle(AActor *thing, double z);
 	FTexture *GetSpriteTexture(AActor *thing, /*out*/ bool &flipX);