diff --git a/polymer/eduke32/build/src/polymer.c b/polymer/eduke32/build/src/polymer.c
index 9a19d2e6f..844ba0d1d 100644
--- a/polymer/eduke32/build/src/polymer.c
+++ b/polymer/eduke32/build/src/polymer.c
@@ -1308,7 +1308,7 @@ void                polymer_drawsprite(int32_t snum)
 
     if (usemodels && tile2model[Ptile2tile(tspr->picnum,tspr->pal)].modelid >= 0 &&
         tile2model[Ptile2tile(tspr->picnum,tspr->pal)].framenum >= 0 &&
-        !spriteext[tspr->owner].flags & SPREXT_NOTMD)
+        !(spriteext[tspr->owner].flags & SPREXT_NOTMD))
     {
         polymer_drawmdsprite(tspr);
         return;