@@ -157,11 +157,11 @@
 #endif /* USE_TCL_STUBS */
 
 /*
  * Forward declarations
  */
-Tcl_ChannelType *Tls_ChannelType(void);
+const Tcl_ChannelType *Tls_ChannelType(void);
 Tcl_Channel     Tls_GetParent(State *statePtr, int maskFlags);
 
 Tcl_Obj         *Tls_NewX509Obj(Tcl_Interp *interp, X509 *cert);
 void            Tls_Error(State *statePtr, char *msg);
 void            Tls_Free(char *blockPtr);