diff --git a/zdefs.acs b/zdefs.acs
index ecff36e..1f08f02 100644
--- a/zdefs.acs
+++ b/zdefs.acs
@@ -293,6 +293,7 @@
 #define APROP_DamageMultiplier	43
 #define APROP_MaxStepHeight 44
 #define APROP_MaxDropOffHeight 45
+#define APROP_DamageType	46
 
 // Render Styles ------------------------------------------------------------