diff --git a/sysdep/bsd/krt-sys.h b/sysdep/bsd/krt-sys.h
index cc3f4a77..870cdf2c 100644
--- a/sysdep/bsd/krt-sys.h
+++ b/sysdep/bsd/krt-sys.h
@@ -46,6 +46,6 @@ static inline void krt_sys_io_init(void) { }
 static inline void krt_sys_init(struct krt_proto *p UNUSED) { }
 static inline void krt_sys_postconfig(struct krt_config *x UNUSED) { }
 
-static inline int krt_sys_get_attr(eattr *a UNUSED, byte *buf UNUSED, int buflen UNUSED) { }
+static inline int krt_sys_get_attr(eattr *a UNUSED, byte *buf UNUSED, int buflen UNUSED) { return GA_UNKNOWN; }
 
 #endif