diff --git a/lib/libthr/arch/ia64/ia64/pthread_md.c b/lib/libthr/arch/ia64/ia64/pthread_md.c
index a6f7defc1056..a662949865ed 100644
--- a/lib/libthr/arch/ia64/ia64/pthread_md.c
+++ b/lib/libthr/arch/ia64/ia64/pthread_md.c
@@ -54,5 +54,5 @@ _tcb_ctor(struct pthread *thread, int initial)
 void
 _tcb_dtor(struct tcb *tcb)
 {
-	_rtld_free_tls(tcb, sizeof(tcb), 16);
+	_rtld_free_tls(tcb, sizeof(struct tcb), 16);
 }