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-rw-r--r--src/include/taler_json_lib.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/include/taler_json_lib.h b/src/include/taler_json_lib.h
index 3dd661a91..79589dba7 100644
--- a/src/include/taler_json_lib.h
+++ b/src/include/taler_json_lib.h
@@ -89,7 +89,7 @@ TALER_JSON_spec_denomination_signature (const char *field,
* @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);
#endif /* TALER_JSON_LIB_H_ */