diff --git a/source/build/src/engine.cpp b/source/build/src/engine.cpp
index 9741651fa..54faa005c 100644
--- a/source/build/src/engine.cpp
+++ b/source/build/src/engine.cpp
@@ -12065,7 +12065,7 @@ void renderPrepareMirror(int32_t dax, int32_t day, int32_t daz, fix16_t daang, f
     inpreparemirror = 1;
 
 #ifdef USE_OPENGL
-    if (videoGetRenderMode() != REND_CLASSIC)
+    if (videoGetRenderMode() == REND_POLYMOST)
         polymost_prepareMirror(dax, day, daz, daang, dahoriz, dawall);
 #endif
 }
@@ -12117,7 +12117,7 @@ void renderPrepareMirrorOld(int32_t dax, int32_t day, int32_t daz, fix16_t daang
 void renderCompleteMirror(void)
 {
 #ifdef USE_OPENGL
-    if (videoGetRenderMode() != REND_CLASSIC)
+    if (videoGetRenderMode() == REND_POLYMOST)
         polymost_completeMirror();
 #endif