diff --git a/src/p_lnspec.cpp b/src/p_lnspec.cpp
index 77682d1e3..9fde1af22 100644
--- a/src/p_lnspec.cpp
+++ b/src/p_lnspec.cpp
@@ -3590,6 +3590,7 @@ static lnSpecFunc LineSpecials[] =
 	/* 270 */ LS_Stairs_BuildDownDoom,
 	/* 271 */ LS_Stairs_BuildUpDoomSync,
 	/* 272 */ LS_Stairs_BuildDownDoomSync,
+	/* 273 */ LS_Stairs_BuildUpDoomCrush,
 
 };