diff --git a/system/proc_state_def.v b/system/proc_state_def.v
index 2839364..354a4ea 100644
--- a/system/proc_state_def.v
+++ b/system/proc_state_def.v
@@ -48,7 +48,6 @@
 
 /*EXECUTE STATE*/
 `define PROC_EX_STATE_ENTRY			6'b100000
-`define PROC_EX_STATE_EXIT			6'b100001
 
 /*MEM/IO WRITE*/
 `define PROC_MEMIO_WRITE			6'b101000