diff --git a/core/hw/pvr/ta_vtx.cpp b/core/hw/pvr/ta_vtx.cpp
index 360aaad73..f98e7560c 100644
--- a/core/hw/pvr/ta_vtx.cpp
+++ b/core/hw/pvr/ta_vtx.cpp
@@ -1592,7 +1592,7 @@ void FillBGP(TA_context* ctx)
 	bool PSVM=FPU_SHAD_SCALE.intensity_shadow!=0; //double parameters for volumes
 
 	//Get the strip base
-	u32 strip_base=(param_base + ISP_BACKGND_T.tag_address*4);	//this is *not* VRAM_MASK on purpose.It fixes naomi bios and quite a few naomi games
+	u32 strip_base=(param_base + ISP_BACKGND_T.tag_address*4) & 0x7FFFFF;	//this is *not* VRAM_MASK on purpose.It fixes naomi bios and quite a few naomi games
 	//i have *no* idea why that happens, they manage to set the render target over there as well
 	//and that area is *not* written by the games (they instead write the params on 000000 instead of 800000)
 	//could be a h/w bug ? param_base is 400000 and tag is 100000*4