diff --git a/polymer/eduke32/build/src/engine.c b/polymer/eduke32/build/src/engine.c
index 4e36e9f4a..2f80a3cbe 100644
--- a/polymer/eduke32/build/src/engine.c
+++ b/polymer/eduke32/build/src/engine.c
@@ -9917,6 +9917,12 @@ void E_MapArt_Clear(void)
     RESTORE_MAPART_ARRAY(picanm, g_bakPicAnm);
 
     E_RecalcPicSiz();
+
+    gltexinvalidatetype(INVALIDATE_ART);
+#ifdef POLYMER
+    if (getrendermode() == REND_POLYMER)
+        polymer_texinvalidate();
+#endif
 }
 
 void E_MapArt_Setup(const char *filename)
@@ -9969,6 +9975,12 @@ void E_MapArt_Setup(const char *filename)
     }
 
     E_RecalcPicSiz();
+
+    gltexinvalidatetype(INVALIDATE_ART);
+#ifdef POLYMER
+    if (getrendermode() == REND_POLYMER)
+        polymer_texinvalidate();
+#endif
 }
 
 //////////////////// LOADING AND SAVING ROUTINES ////////////////////