1 files changed, 1 insertions, 1 deletions

diff --git a/src/include/gnunet_testbed_service.h b/src/include/gnunet_testbed_service.h
index 7d46f6bcf..ef5821aab 100644
--- a/src/include/gnunet_testbed_service.h
+++ b/src/include/gnunet_testbed_service.h
@@ -1345,7 +1345,7 @@ GNUNET_TESTBED_get_statistics (unsigned int num_peers,
  * @return The peer's unique ID.
  */
 uint32_t
-GNUNET_TESTBED_get_index (struct GNUNET_TESTBED_Peer *peer);
+GNUNET_TESTBED_get_index (const struct GNUNET_TESTBED_Peer *peer);
 
 /**
  * Handle for testbed run helper funtions