diff --git a/benchmark_test.go b/benchmark_test.go
index 0b52dda..605ee7a 100644
--- a/benchmark_test.go
+++ b/benchmark_test.go
@@ -52,7 +52,7 @@ func BenchmarkInsert(b *testing.B) {
 		})
 	})
 
-	pgxDB, err := ksql.NewWithPGX(ctx, driver, connStr, ksql.Config{
+	pgxDB, err := ksql.NewWithPGX(ctx, connStr, ksql.Config{
 		MaxOpenConns: 1,
 	})
 	if err != nil {
@@ -165,7 +165,7 @@ func BenchmarkQuery(b *testing.B) {
 		})
 	})
 
-	pgxDB, err := ksql.NewWithPGX(ctx, driver, connStr, ksql.Config{
+	pgxDB, err := ksql.NewWithPGX(ctx, connStr, ksql.Config{
 		MaxOpenConns: 1,
 	})
 	if err != nil {
diff --git a/ksql.go b/ksql.go
index 049fec4..eafeefe 100644
--- a/ksql.go
+++ b/ksql.go
@@ -103,7 +103,6 @@ func New(
 // library in the backend
 func NewWithPGX(
 	ctx context.Context,
-	dbDriver string,
 	connectionString string,
 	config Config,
 ) (db DB, err error) {
@@ -122,7 +121,7 @@ func NewWithPGX(
 		return DB{}, err
 	}
 
-	db, err = NewWithAdapter(PGXAdapter{pool}, dbDriver, connectionString)
+	db, err = NewWithAdapter(PGXAdapter{pool}, "postgres", connectionString)
 	return db, err
 }