diff --git a/SqliteBench_test.go b/SqliteBench_test.go
index 05fb221..fea5de7 100644
--- a/SqliteBench_test.go
+++ b/SqliteBench_test.go
@@ -18,7 +18,7 @@ func Benchmark_Zombiezen(b *testing.B) {
 
 	// Create and open database
 
-	dbpool, err := sqlitex.Open(filepath.Join(b.TempDir(), "db.db"), sqlite.OpenCreate|sqlite.OpenReadWrite|sqlite.OpenWAL|sqlite.OpenNoMutex, 10)
+	dbpool, err := sqlitex.Open(filepath.Join(b.TempDir(), "db.db"), sqlite.OpenCreate|sqlite.OpenReadWrite|sqlite.OpenWAL|sqlite.OpenNoMutex, 100)
 	require.NoError(b, err)
 
 	// Create table
@@ -42,14 +42,18 @@ func Benchmark_Zombiezen(b *testing.B) {
 	b.Run("Queries", func(b *testing.B) {
 		b.RunParallel(func(p *testing.PB) {
 			for p.Next() {
+				var as, bs, cs string
 				conn := dbpool.Get(context.Background())
 				_ = sqlitex.Exec(conn, "select a, b, c from test where a = ?;", func(stmt *sqlite.Stmt) error {
-					_ = stmt.ColumnText(0)
-					_ = stmt.ColumnText(1)
-					_ = stmt.ColumnText(2)
+					as = stmt.ColumnText(0)
+					bs = stmt.ColumnText(1)
+					cs = stmt.ColumnText(2)
 					return nil
 				}, strconv.Itoa(rand.Intn(1000)))
 				dbpool.Put(conn)
+				if as == "" || bs == "" || cs == "" {
+					b.FailNow()
+				}
 			}
 		})
 	})
@@ -62,7 +66,7 @@ func Benchmark_Mattn(b *testing.B) {
 
 	db, err := sql.Open("sqlite3", filepath.Join(b.TempDir(), "db.db")+"?mode=rwc&_journal_mode=WAL")
 	require.NoError(b, err)
-	db.SetMaxOpenConns(10)
+	db.SetMaxOpenConns(100)
 
 	// Create table
 
@@ -81,10 +85,13 @@ func Benchmark_Mattn(b *testing.B) {
 	b.Run("Queries", func(b *testing.B) {
 		b.RunParallel(func(p *testing.PB) {
 			for p.Next() {
-				var a, b, c string
+				var as, bs, cs string
 				rows, _ := db.Query("select a, b, c from test where a = ?;", strconv.Itoa(rand.Intn(1000)))
 				for rows.Next() {
-					rows.Scan(&a, &b, &c)
+					rows.Scan(&as, &bs, &cs)
+				}
+				if as == "" || bs == "" || cs == "" {
+					b.FailNow()
 				}
 			}
 		})