diff --git a/selftest.cpp b/selftest.cpp
index 4008cd2a7..c7a786819 100644
--- a/selftest.cpp
+++ b/selftest.cpp
@@ -999,7 +999,7 @@ struct TestPhyHandlers
 	inline void phyOnUnixAccept(PhySocket *sockL,PhySocket *sockN,void **uptrL,void **uptrN) {}
 	inline void phyOnUnixClose(PhySocket *sock,void **uptr) {}
 	inline void phyOnUnixData(PhySocket *sock,void **uptr,void *data,unsigned long len) {}
-	inline void phyOnUnixWritable(PhySocket *sock,void **uptr,bool b) {}
+	inline void phyOnUnixWritable(PhySocket *sock,void **uptr) {}
 #endif // __UNIX_LIKE__
 
 	inline void phyOnFileDescriptorActivity(PhySocket *sock,void **uptr,bool readable,bool writable) {}