diff --git a/source/blood/src/mirrors.cpp b/source/blood/src/mirrors.cpp
index 48f5dcbe6..0eb345ccf 100644
--- a/source/blood/src/mirrors.cpp
+++ b/source/blood/src/mirrors.cpp
@@ -365,7 +365,7 @@ void DrawMirrors(int x, int y, int z, fix16_t a, fix16_t horiz, int smooth, int
             {
                 gMirrorDrawing = true;
                 const int bakNumsectors = numsectors;
-                if (numsectors < kMaxSectors-1)
+                if ((numsectors < kMaxSectors-1) && !VanillaMode())
                     numsectors++; // needed for rendering else operations like getzrange will crash when checking mirror sector
                 int nWall = mirror[i].at4;
                 int nSector = sectorofwall(nWall);