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-rw-r--r--src/json/json.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/json/json.c b/src/json/json.c
index 1fbc59a73..da9e8b9f8 100644
--- a/src/json/json.c
+++ b/src/json/json.c
@@ -32,7 +32,7 @@
* @return #GNUNET_OK on success, #GNUNET_SYSERR on error
*/
int
-TALER_JSON_hash (json_t *json,
+TALER_JSON_hash (const json_t *json,
struct GNUNET_HashCode *hc)
{
char *wire_enc;