diff --git a/src/ds/gx.c b/src/ds/gx.c
index 71d44fc55..fd5202b34 100644
--- a/src/ds/gx.c
+++ b/src/ds/gx.c
@@ -24,8 +24,6 @@ static void DSGXDummyRendererWriteRegister(struct DSGXRenderer* renderer, uint32
 
 static void DSGXWriteFIFO(struct DSGX* gx, struct DSGXEntry entry);
 
-static bool _boxTestVertex(struct DSGX* gx, struct DSGXVertex* vertex);
-
 static const int32_t _gxCommandCycleBase[DS_GX_CMD_MAX] = {
 	[DS_GX_CMD_NOP] = 0,
 	[DS_GX_CMD_MTX_MODE] = 2,
@@ -541,15 +539,6 @@ static void _flushOutstanding(struct DSGX* gx) {
 	}
 }
 
-static bool _boxTestVertex(struct DSGX* gx, struct DSGXVertex* vertex) {
-	vertex->viewCoord[0] = _dotViewport(vertex, &gx->clipMatrix.m[0]);
-	vertex->viewCoord[1] = _dotViewport(vertex, &gx->clipMatrix.m[1]);
-	vertex->viewCoord[2] = _dotViewport(vertex, &gx->clipMatrix.m[2]);
-	vertex->viewCoord[3] = _dotViewport(vertex, &gx->clipMatrix.m[3]);
-
-	return !_cohenSutherlandCode(vertex);
-}
-
 static bool _boxTest(struct DSGX* gx) {
 	int16_t x = gx->activeEntries[0].params[0];
 	x |= gx->activeEntries[0].params[1] << 8;