Index: uspace/lib/c/generic/rtld/module.c
===================================================================
--- uspace/lib/c/generic/rtld/module.c	(revision a0e2f9c02e925fe55edcddd719921c8dbd541cde)
+++ uspace/lib/c/generic/rtld/module.c	(revision 663f445f6ae6d51eff8cb7bcc345d4a411d3ff7e)
@@ -40,4 +40,5 @@
 #include <errno.h>
 #include <loader/pcb.h>
+#include <stdalign.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -353,5 +354,5 @@
 #ifdef CONFIG_TLS_VARIANT_1
 	rtld->tls_size = sizeof(tcb_t);
-	rtld->tls_align = _Alignof(tcb_t);
+	rtld->tls_align = alignof(tcb_t);
 
 	list_foreach(rtld->modules, modules_link, module_t, m) {
@@ -366,5 +367,5 @@
 #else
 	rtld->tls_size = 0;
-	rtld->tls_align = _Alignof(tcb_t);
+	rtld->tls_align = alignof(tcb_t);
 
 	list_foreach(rtld->modules, modules_link, module_t, m) {