diff --git a/zdefs.acs b/zdefs.acs
index 4a6a6a3..3a32219 100644
--- a/zdefs.acs
+++ b/zdefs.acs
@@ -289,6 +289,8 @@
 #define APROP_ViewHeight	39
 #define APROP_AttackZOffset	40
 #define APROP_StencilColor	41
+#define APROP_Friction		42
+#define APROP_DamageMultiplier	43
 
 // Render Styles ------------------------------------------------------------