diff --git a/src/mint/mint_db.c b/src/mint/mint_db.c
index 71e222008..2797f2169 100644
--- a/src/mint/mint_db.c
+++ b/src/mint/mint_db.c
@@ -43,7 +43,7 @@ static pthread_key_t db_conn_threadlocal;
 
 
 #define QUERY_ERR(result)                          \
-  GNUNET_log (GNUNET_ERROR_TYPE_ERROR,  "%s: query failed: %s\n", __FUNCTION__, PQresultErrorMessage (result))
+  GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Query failed at %s:%u: %s\n", __FILE__, __LINE__, PQresultErrorMessage (result))
 
 /**
  * Database connection string, as read from
@@ -77,6 +77,12 @@ static char *TALER_MINT_db_connection_cfg_str;
     PQclear (result); result = NULL;                                    \
   } while (0)
 
+/**
+ * This the length of the currency strings (without 0-termination) we use.  Note
+ * that we need to use this at the DB layer instead of TALER_CURRENCY_LEN as the
+ * DB only needs to store 3 bytes instead of 8 bytes.
+ */
+#define TALER_DB_CURRENCY_LEN 3
 
 /**
  * Set the given connection to use a temporary schema
@@ -837,11 +843,11 @@ TALER_MINT_DB_reserves_in_insert (PGconn *db,
     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                 "Reserve does not exist; creating a new one\n");
     struct TALER_DB_QueryParam params[] = {
-      TALER_DB_QUERY_PARAM_PTR_SIZED (reserve->pub, sizeof (reserve->pub)),
+      TALER_DB_QUERY_PARAM_PTR (reserve->pub),
       TALER_DB_QUERY_PARAM_PTR (&balance_nbo.value),
       TALER_DB_QUERY_PARAM_PTR (&balance_nbo.fraction),
       TALER_DB_QUERY_PARAM_PTR_SIZED (balance_nbo.currency,
-                                      TALER_CURRENCY_LEN),
+                                      TALER_DB_CURRENCY_LEN),
       TALER_DB_QUERY_PARAM_PTR (&expiry_nbo),
       TALER_DB_QUERY_PARAM_END
     };
@@ -866,7 +872,7 @@ TALER_MINT_DB_reserves_in_insert (PGconn *db,
   result = TALER_DB_exec_prepared (db,
                                    "create_reserves_in_transaction",
                                    params);
-  if (PGRES_COMMAND_OK != result)
+  if (PGRES_COMMAND_OK != PQresultStatus(result))
   {
     QUERY_ERR (result);
     goto rollback;
diff --git a/src/mint/test_mint_db.c b/src/mint/test_mint_db.c
index 4fa84eb38..192bc1e09 100644
--- a/src/mint/test_mint_db.c
+++ b/src/mint/test_mint_db.c
@@ -39,6 +39,10 @@ run (void *cls, char *const *args, const char *cfgfile,
      const struct GNUNET_CONFIGURATION_Handle *config)
 {
   PGconn *db;
+  struct GNUNET_CRYPTO_EddsaPublicKey pub;
+  struct Reserve reserve;
+  struct GNUNET_TIME_Absolute expiry;
+  struct TALER_Amount amount;
 
   db = NULL;
   if (GNUNET_OK != TALER_MINT_DB_init ("postgres:///taler"))
@@ -56,6 +60,22 @@ run (void *cls, char *const *args, const char *cfgfile,
     result = 3;
     goto drop;
   }
+  GNUNET_CRYPTO_random_block (GNUNET_CRYPTO_QUALITY_WEAK,
+                              &pub, sizeof (pub));
+  reserve.pub = &pub;
+  amount.value = 1;
+  amount.fraction = 1;
+  strcpy (amount.currency, "EUR");
+  expiry = GNUNET_TIME_absolute_add (GNUNET_TIME_absolute_get (),
+                                     GNUNET_TIME_UNIT_HOURS);
+  if (GNUNET_OK != TALER_MINT_DB_reserves_in_insert (db,
+                                                     &reserve,
+                                                     amount,
+                                                     expiry))
+  {
+    result = 4;
+    goto drop;
+  }
   result = 0;
  drop:
   if (NULL != db)