diff --git a/include/os.h b/include/os.h
index 5ba65e641..28fb15ebd 100644
--- a/include/os.h
+++ b/include/os.h
@@ -93,8 +93,6 @@ typedef struct _NewClientRec *NewClientPtr;
 extern void ddxBeforeReset(void);
 #endif
 
-extern _X_EXPORT Bool WaitForSomething(Bool clients_are_ready);
-
 extern _X_EXPORT int ReadRequestFromClient(ClientPtr /*client */ );
 
 extern _X_EXPORT int ReadFdFromClient(ClientPtr client);
diff --git a/os/osdep.h b/os/osdep.h
index d8d8e39c8..a7d793f2d 100644
--- a/os/osdep.h
+++ b/os/osdep.h
@@ -243,4 +243,6 @@ void ListenToAllClients(void);
 /* allow DDX to force using another clock */
 void ForceClockId(clockid_t forced_clockid);
 
+Bool WaitForSomething(Bool clients_are_ready);
+
 #endif                          /* _OSDEP_H_ */