diff --git a/src/RSP.h b/src/RSP.h
index 42154418..609d7f3a 100644
--- a/src/RSP.h
+++ b/src/RSP.h
@@ -16,7 +16,7 @@ extern RSPInfo RSP;
 
 extern u32 DepthClearColor;
 
-#define RSP_SegmentToPhysical( segaddr ) ((gSP.segment[(segaddr >> 24) & 0x0F] + (segaddr & 0x00FFFFFF)) & 0x00FFFFFF)
+#define RSP_SegmentToPhysical( segaddr ) ((gSP.segment[(segaddr >> 24) & 0x0F] + (segaddr & RDRAMSize)) & RDRAMSize)
 
 void RSP_Init();
 void RSP_ProcessDList();