diff --git a/lib/libthr/thread/thr_rtld.c b/lib/libthr/thread/thr_rtld.c
--- a/lib/libthr/thread/thr_rtld.c
+++ b/lib/libthr/thread/thr_rtld.c
@@ -220,19 +220,19 @@
 	struct RtldLockInfo	li;
 	struct pthread		*curthread;
 	ucontext_t *uc;
-	long dummy = -1;
 	int uc_len;
+	char dummy[2] = {};
 
 	curthread = _get_curthread();
 
 	/* force to resolve _umtx_op PLT */
-	_umtx_op_err((struct umtx *)&dummy, UMTX_OP_WAKE, 1, 0, 0);
+	_umtx_op_err(&dummy, UMTX_OP_WAKE, 1, 0, 0);
 	
 	/* force to resolve errno() PLT */
 	__error();
 
 	/* force to resolve memcpy PLT */
-	memcpy(&dummy, &dummy, sizeof(dummy));
+	memcpy(&dummy[0], &dummy[1], 1);
 
 	mprotect(NULL, 0, 0);
 	_rtld_get_stack_prot();