1 files changed, 4 insertions, 0 deletions

diff --git a/src/include/gnunet_peer_lib.h b/src/include/gnunet_peer_lib.h
index e4a34021a..4a67878b9 100644
--- a/src/include/gnunet_peer_lib.h
+++ b/src/include/gnunet_peer_lib.h
@@ -18,6 +18,10 @@
      SPDX-License-Identifier: AGPL3.0-or-later
  */
 
+#if !defined (__GNUNET_UTIL_LIB_H_INSIDE__)
+#error "Only <gnunet_util_lib.h> can be included directly."
+#endif
+
 /**
  * @addtogroup libgnunetutil
  * Multi-function utilities library for GNUnet programs