diff --git a/code/rd-vanilla/tr_WorldEffects.cpp b/code/rd-vanilla/tr_WorldEffects.cpp
index 6c65c8dad9..f102e675b6 100644
--- a/code/rd-vanilla/tr_WorldEffects.cpp
+++ b/code/rd-vanilla/tr_WorldEffects.cpp
@@ -782,7 +782,8 @@ class COutside
 
 									// Mark The Point
 									//----------------
-									wz.mPointCache[((z * wz.mWidth * wz.mHeight) + (y * wz.mWidth) + x)] |= bit;
+									if (curPosOutside)
+										wz.mPointCache[((z * wz.mWidth * wz.mHeight) + (y * wz.mWidth) + x)] |= bit;
 								}
 							}// for (y)
 						}// for (x)