diff --git a/include/os.h b/include/os.h
index 782135bef..2a39d49bd 100644
--- a/include/os.h
+++ b/include/os.h
@@ -150,8 +150,6 @@ static inline void RemoveNotifyFd(int fd)
     (void) SetNotifyFd(fd, NULL, X_NOTIFY_NONE, NULL);
 }
 
-extern _X_EXPORT int OnlyListenToOneClient(ClientPtr /*client */ );
-
 extern _X_EXPORT void ListenToAllClients(void);
 
 extern _X_EXPORT void IgnoreClient(ClientPtr /*client */ );
diff --git a/os/osdep.h b/os/osdep.h
index be3389b57..b5d15df0a 100644
--- a/os/osdep.h
+++ b/os/osdep.h
@@ -245,4 +245,6 @@ extern void (*OsVendorVErrorFProc) (const char *, va_list args)
 void MakeClientGrabPervious(ClientPtr client);
 void MakeClientGrabImpervious(ClientPtr client);
 
+int OnlyListenToOneClient(ClientPtr client);
+
 #endif                          /* _OSDEP_H_ */