diff --git a/src/r_bsp.cpp b/src/r_bsp.cpp
index 17ff09eef..efb34d870 100644
--- a/src/r_bsp.cpp
+++ b/src/r_bsp.cpp
@@ -69,7 +69,10 @@ boolean R_NoEncore(sector_t *sector, levelflat_t *flat, boolean ceiling)
 	const terrain_t *terrain = (flat != NULL ? flat->terrain : NULL);
 	const sectorspecialflags_t flags = sector->specialflags;
 
-	if (flags & (SSF_SNEAKERPANEL|SSF_WATERPANEL|SSF_YELLOWPOGOSPRING|SSF_REDPOGOSPRING))
+	if (!(flags & SSF_SNEAKERPANEL
+		|| flags & SSF_WATERPANEL
+		|| flags & SSF_YELLOWPOGOSPRING
+		|| flags & SSF_REDPOGOSPRING))
 	{
 		// Automatically handle encore invert for sneaker, water and pogospring panels.
 		return invertEncore;