Index: uspace/lib/c/include/assert.h
===================================================================
--- uspace/lib/c/include/assert.h	(revision 4805495a910f793f8918c13f029a38a5bb548154)
+++ uspace/lib/c/include/assert.h	(revision 9be2358aadbef3865ee2b3ab546d8b1f56d79cd6)
@@ -41,7 +41,11 @@
 #define _LIBC_ASSERT_H_
 
+#include <_bits/decls.h>
+
 #ifndef __cplusplus
 #define static_assert _Static_assert
 #endif
+
+__C_DECLS_BEGIN;
 
 extern void __helenos_assert_abort(const char *, const char *, unsigned int)
@@ -50,4 +54,6 @@
 extern void __helenos_assert_quick_abort(const char *, const char *, unsigned int)
     __attribute__((noreturn));
+
+__C_DECLS_END;
 
 #endif