Index: uspace/lib/c/generic/private/futex.h
===================================================================
--- uspace/lib/c/generic/private/futex.h	(revision 34c76e2fc56d7e5a4922e24522df3d9d48503150)
+++ uspace/lib/c/generic/private/futex.h	(revision 42da5ed63dc4e81e1aed2c903e5dbd1b1045978c)
@@ -46,6 +46,5 @@
 	volatile atomic_int val;
 #ifdef CONFIG_DEBUG_FUTEX
-	// FIXME: Should be _Atomic(fibril_t *)
-	fibril_t *owner;
+	_Atomic(fibril_t *) owner;
 #endif
 } futex_t;