diff --git a/src/hardware/hw_main.c b/src/hardware/hw_main.c
index e9fb599d3b1c8d44468454d544737e5720a26d14..c00767e3bd37afe02d2afbad51a4349c95a3e6bd 100644
--- a/src/hardware/hw_main.c
+++ b/src/hardware/hw_main.c
@@ -2669,7 +2669,7 @@ static void HWR_Subsector(size_t num)
 // BP: big hack for a test in lighning ref : 1249753487AB
 fixed_t *hwbbox;
 
-void HWR_RenderBSPNode(INT32 bspnum)
+static void HWR_RenderBSPNode(INT32 bspnum)
 {
 	node_t *bsp;
 	INT32 side;