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-rw-r--r--src/util/payto.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/util/payto.c b/src/util/payto.c
index c596f8d3f..971e24961 100644
--- a/src/util/payto.c
+++ b/src/util/payto.c
@@ -193,7 +193,7 @@ TALER_payto_validate (const char *payto_uri)
/* This is more strict than RFC 8905, alas we do not need to support messages/instructions/etc.,
and it is generally better to start with a narrow whitelist; we can be more permissive later ...*/
#define ALLOWED_CHARACTERS \
- "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789/:&?-.,="
+ "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789/:&?-.,=+"
if (NULL == strchr (ALLOWED_CHARACTERS,
(int) payto_uri[i]))
{