diff --git a/g10/tofu.c b/g10/tofu.c
index 2d4c738e4..651092782 100644
--- a/g10/tofu.c
+++ b/g10/tofu.c
@@ -2248,6 +2248,7 @@ tofu_register (const byte *fingerprint_bin, const char *user_id,
   xfree (fingerprint);
   if (dbs)
     closedbs (dbs);
+  xfree (sig_digest);
 
   return trust_level;
 }