diff --git a/config.go b/config.go
index 4ca09dda..8fd7efbf 100644
--- a/config.go
+++ b/config.go
@@ -822,7 +822,7 @@ func ValidateConnectTargetSessionAttrsPreferStandby(ctx context.Context, pgConn
 	}
 
 	if string(result.Rows[0][0]) != "t" {
-		return &NotStandbyError{err: errors.New("server is not in hot standby mode")}
+		return &NotPreferredError{err: errors.New("server is not in hot standby mode")}
 	}
 
 	return nil
diff --git a/errors.go b/errors.go
index 9f04476d..66d35584 100644
--- a/errors.go
+++ b/errors.go
@@ -220,19 +220,19 @@ func redactURL(u *url.URL) string {
 	return u.String()
 }
 
-type NotStandbyError struct {
+type NotPreferredError struct {
 	err         error
 	safeToRetry bool
 }
 
-func (e *NotStandbyError) Error() string {
+func (e *NotPreferredError) Error() string {
 	return fmt.Sprintf("standby server not found: %s", e.err.Error())
 }
 
-func (e *NotStandbyError) SafeToRetry() bool {
+func (e *NotPreferredError) SafeToRetry() bool {
 	return e.safeToRetry
 }
 
-func (e *NotStandbyError) Unwrap() error {
+func (e *NotPreferredError) Unwrap() error {
 	return e.err
 }
diff --git a/pgconn.go b/pgconn.go
index 5e436ffe..6093d17b 100644
--- a/pgconn.go
+++ b/pgconn.go
@@ -168,7 +168,7 @@ func ConnectConfig(ctx context.Context, config *Config) (pgConn *PgConn, err err
 				break
 			}
 		} else if cerr, ok := err.(*connectError); ok {
-			if _, ok := cerr.err.(*NotStandbyError); ok {
+			if _, ok := cerr.err.(*NotPreferredError); ok {
 				fallbackConfig = fc
 			}
 		}