diff --git a/src/ckpool.h b/src/ckpool.h
index 5306816b..18e72a16 100644
--- a/src/ckpool.h
+++ b/src/ckpool.h
@@ -14,8 +14,6 @@
 
 #include "libckpool.h"
 
-struct proc_instance;
-typedef struct proc_instance proc_instance_t;
 struct ckpool_instance;
 typedef struct ckpool_instance ckpool_t;