diff --git a/lib/libiscsiutil/libiscsiutil.h b/lib/libiscsiutil/libiscsiutil.h
--- a/lib/libiscsiutil/libiscsiutil.h
+++ b/lib/libiscsiutil/libiscsiutil.h
@@ -95,6 +95,8 @@
 	size_t		rchap_challenge_len;
 };
 
+__BEGIN_DECLS
+
 struct chap		*chap_new(void);
 char			*chap_get_id(const struct chap *chap);
 char			*chap_get_challenge(const struct chap *chap);
@@ -174,4 +176,6 @@
 
 char			*checked_strdup(const char *);
 
+__END_DECLS
+
 #endif /* !__LIBISCSIUTIL_H__ */