diff --git a/nptl/sysdeps/alpha/tls.h b/nptl/sysdeps/alpha/tls.h
index fa3c832a68..20f780c5f5 100644
--- a/nptl/sysdeps/alpha/tls.h
+++ b/nptl/sysdeps/alpha/tls.h
@@ -65,7 +65,7 @@ typedef union dtv
 typedef struct
 {
   dtv_t *dtv;
-  void *private;
+  void *__private;
 } tcbhead_t;
 
 /* This is the size of the initial TCB.  */