1 files changed, 1 insertions, 1 deletions

diff --git a/src/transport/gnunet-transport-certificate-creation.c b/src/transport/gnunet-transport-certificate-creation.c
index 129df7b35..edaf4773a 100644
--- a/src/transport/gnunet-transport-certificate-creation.c
+++ b/src/transport/gnunet-transport-certificate-creation.c
@@ -44,7 +44,7 @@ make_dev_zero (int fd,
   GNUNET_assert (-1 != z);
   if (z == fd)
     return;
-  dup2 (z, fd);
+  GNUNET_break (fd == dup2 (z, fd));
   GNUNET_assert (0 == close (z));
 }
 #endif