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--- a/ports/sysdeps/aarch64/nptl/tls.h
+++ b/ports/sysdeps/aarch64/nptl/tls.h
@@ -63,7 +63,7 @@ typedef struct
 # define TLS_INIT_TCB_SIZE	sizeof (tcbhead_t)
 
 /* Alignment requirements for the initial TCB.  */
-# define TLS_INIT_TCB_ALIGN	__alignof__ (tcbhead_t)
+# define TLS_INIT_TCB_ALIGN	__alignof__ (struct pthread)
 
 /* This is the size of the TCB.  */
 # define TLS_TCB_SIZE		sizeof (tcbhead_t)
@@ -72,7 +72,7 @@ typedef struct
 # define TLS_PRE_TCB_SIZE	sizeof (struct pthread)
 
 /* Alignment requirements for the TCB.  */
-# define TLS_TCB_ALIGN		__alignof__ (tcbhead_t)
+# define TLS_TCB_ALIGN		__alignof__ (struct pthread)
 
 /* Install the dtv pointer.  The pointer passed is to the element with
    index -1 which contain the length.  */