diff --git a/Xext/security.c b/Xext/security.c
index df4fd922b..b0715e3df 100644
--- a/Xext/security.c
+++ b/Xext/security.c
@@ -35,6 +35,7 @@ in this Software without prior written authorization from The Open Group.
 #include "include/extinit_priv.h"
 #include "os/audit.h"
 #include "os/auth.h"
+#include "os/client_priv.h"
 #include "os/osdep.h"
 
 #include "scrnintstr.h"
diff --git a/include/os.h b/include/os.h
index eab28747b..af8ffbb40 100644
--- a/include/os.h
+++ b/include/os.h
@@ -115,8 +115,6 @@ extern _X_EXPORT void ResetWellKnownSockets(void);
 
 extern _X_EXPORT void CloseWellKnownConnections(void);
 
-extern _X_EXPORT XID AuthorizationIDOfClient(ClientPtr /*client */ );
-
 extern _X_EXPORT const char *ClientAuthorized(ClientPtr /*client */ ,
                                               unsigned int /*proto_n */ ,
                                               char * /*auth_proto */ ,
diff --git a/os/client_priv.h b/os/client_priv.h
index abbda2b9d..a74c73fc8 100644
--- a/os/client_priv.h
+++ b/os/client_priv.h
@@ -34,5 +34,6 @@ const char *GetClientCmdName(struct _Client *client);
 const char *GetClientCmdArgs(struct _Client *client);
 
 Bool ClientIsLocal(struct _Client *client);
+XID AuthorizationIDOfClient(struct _Client *client);
 
 #endif /* _XSERVER_DIX_CLIENT_PRIV_H */
diff --git a/os/connection.c b/os/connection.c
index 997d06405..07d6cbe8a 100644
--- a/os/connection.c
+++ b/os/connection.c
@@ -97,6 +97,7 @@ SOFTWARE.
 #include "dix/dix_priv.h"
 #include "os/audit.h"
 #include "os/auth.h"
+#include "os/client_priv.h"
 #include "os/osdep.h"
 
 #include "misc.h"               /* for typedef of pointer */