diff --git a/plugins/include/cstrike.inc b/plugins/include/cstrike.inc
index 7c1f33b7..ffc1fa2a 100644
--- a/plugins/include/cstrike.inc
+++ b/plugins/include/cstrike.inc
@@ -42,6 +42,7 @@
 
 #define CS_SLOT_PRIMARY		0	/**< Primary weapon slot. */
 #define CS_SLOT_SECONDARY	1	/**< Secondary weapon slot. */
+#define CS_SLOT_KNIFE		2	/**< Knife slot. */
 #define CS_SLOT_GRENADE		3	/**< Grenade slot (will only return one grenade). */
 #define CS_SLOT_C4			4	/**< C4 slot. */