diff --git a/wadsrc/static/zscript/constants.txt b/wadsrc/static/zscript/constants.txt
index 47cf4accda..ef20e23107 100644
--- a/wadsrc/static/zscript/constants.txt
+++ b/wadsrc/static/zscript/constants.txt
@@ -416,6 +416,7 @@ enum ESoundFlags
 	CHAN_MAYBE_LOCAL = 16,
 	CHAN_UI = 32,
 	CHAN_NOPAUSE = 64,
+	CHAN_LOOP = 256,
 	CHAN_PICKUP = (CHAN_ITEM|CHAN_MAYBE_LOCAL),
 	CHAN_NOSTOP = 4096