1 files changed, 2 insertions, 2 deletions

diff --git a/src/include/gnunet_strings_lib.h b/src/include/gnunet_strings_lib.h
index 997ca7dd9..55b96fc2c 100644
--- a/src/include/gnunet_strings_lib.h
+++ b/src/include/gnunet_strings_lib.h
@@ -230,8 +230,8 @@ GNUNET_STRINGS_get_short_name (const char *filename);
  * @return pointer to the next byte in 'out' or NULL on error.
  */
 char *
-GNUNET_STRINGS_data_to_string (unsigned char *data, size_t size,
-                              char *out, size_t out_size);
+GNUNET_STRINGS_data_to_string (const unsigned char *data, size_t size,
+                               char *out, size_t out_size);
 
 
 /**