diff --git a/dix/dix_priv.h b/dix/dix_priv.h
index f7164f3fc..80739e8ce 100644
--- a/dix/dix_priv.h
+++ b/dix/dix_priv.h
@@ -365,4 +365,13 @@ int ClientSignalAll(ClientPtr pClient, ClientSleepProcPtr func, void *closure)
 void ClientWakeup(ClientPtr pclient)
     _X_ATTRIBUTE_NONNULL_ARG(1);
 
+/*
+ * @brief check whether client is asleep
+ *
+ * @param pClient pointer to client structure
+ * @return TRUE if client is sleeping and has no work to do
+ */
+Bool ClientIsAsleep(ClientPtr pClient)
+    _X_ATTRIBUTE_NONNULL_ARG(1);
+
 #endif /* _XSERVER_DIX_PRIV_H */
diff --git a/include/dix.h b/include/dix.h
index c94b09859..091b05901 100644
--- a/include/dix.h
+++ b/include/dix.h
@@ -216,8 +216,6 @@ extern _X_EXPORT Bool QueueWorkProc(Bool (*function)(ClientPtr clientUnused,
                                     ClientPtr client,
                                     void *closure);
 
-extern _X_EXPORT Bool ClientIsAsleep(ClientPtr /*client */ );
-
 extern _X_EXPORT void SendGraphicsExpose(ClientPtr /*client */ ,
                                          RegionPtr /*pRgn */ ,
                                          XID /*drawable */ ,