diff --git a/code/fgame/navigate.h b/code/fgame/navigate.h
index ac4fdf8d..095093dc 100644
--- a/code/fgame/navigate.h
+++ b/code/fgame/navigate.h
@@ -131,7 +131,7 @@ typedef enum {
 // Added in 2.0
 #define AI_LOW_WALL_ARC      256
 
-#define AI_COVERFLAGS        (AI_CRATE | AI_SNIPER | AI_CORNER_RIGHT | AI_CORNER_LEFT | AI_CONCEALMENT | AI_COVER)
+#define AI_COVERFLAGS        (AI_CRATE | AI_SNIPER | AI_CORNER_RIGHT | AI_CORNER_LEFT | AI_CONCEALMENT | AI_COVER | AI_LOW_WALL_ARC)
 #define AI_COVERFLAGS2       (AI_SNIPER | AI_CORNER_RIGHT | AI_CORNER_LEFT | AI_CONCEALMENT)
 #define AI_COVERFLAGS3       (AI_SNIPER | AI_CORNER_RIGHT | AI_CORNER_LEFT | AI_CONCEALMENT | AI_DUCK | AI_CONCEALMENT)
 #define AI_SNIPERFLAGS       (AI_SNIPER | AI_CORNER_RIGHT | AI_CORNER_LEFT | AI_COVER)
@@ -139,6 +139,7 @@ typedef enum {
 #define AI_COVER_LEFT_FLAGS  (AI_CRATE | AI_SNIPER | AI_CORNER_LEFT | AI_CONCEALMENT | AI_DUCK)
 #define AI_COVER_RIGHT_FLAGS (AI_CRATE | AI_SNIPER | AI_CORNER_RIGHT | AI_CONCEALMENT | AI_DUCK)
 #define AI_COVER_MASK        (AI_CRATE | AI_CORNER_RIGHT | AI_CORNER_LEFT | AI_CONCEALMENT | AI_COVER)
+#define AI_CONCEALMENT_MASK  (AI_CRATE | AI_CORNER_RIGHT | AI_CONCEALMENT | AI_LOW_WALL_ARC)
 #define AI_ALL               (AI_DUCK | AI_COVER | AI_CONCEALMENT | AI_CORNER_LEFT | AI_CORNER_RIGHT | AI_SNIPER | AI_CRATE)
 
 void DrawNode(int iNodeCount);