diff --git a/src/mint/taler-mint-httpd_keystate.c b/src/mint/taler-mint-httpd_keystate.c
index 210262e6c..0e5f5bb0f 100644
--- a/src/mint/taler-mint-httpd_keystate.c
+++ b/src/mint/taler-mint-httpd_keystate.c
@@ -385,7 +385,7 @@ TALER_MINT_get_denom_key (const struct MintKeyState *key_state,
 static void
 handle_signal (int signal_number)
 {
-  size_t res;
+  ssize_t res;
   char c = signal_number;
 
   if (SIGUSR1 == signal_number)
diff --git a/src/mint/taler-mint-httpd_responses.c b/src/mint/taler-mint-httpd_responses.c
index 2c46a3246..c9607a221 100644
--- a/src/mint/taler-mint-httpd_responses.c
+++ b/src/mint/taler-mint-httpd_responses.c
@@ -283,8 +283,9 @@ TALER_MINT_reply_deposit_success (struct MHD_Connection *connection,
   dc.amount = TALER_amount_hton (*amount);
   dc.coin_pub = *coin_pub;
   dc.merchant = *merchant;
-  TALER_MINT_keys_sign (&dc.purpose,
-                        &sig);
+  if (GNUNET_OK !=
+      TALER_MINT_keys_sign (&dc.purpose,
+                            &sig))
   {
     LOG_WARNING ("Failed to create EdDSA signature using my private key\n");
     return TALER_MINT_reply_internal_error (connection,