diff --git a/parity/params.rs b/parity/params.rs
index df0730b59..a1b28406a 100644
--- a/parity/params.rs
+++ b/parity/params.rs
@@ -253,16 +253,17 @@ pub fn tracing_switch_to_bool(switch: Switch, user_defaults: &UserDefaults) -> R
 }
 
 pub fn fatdb_switch_to_bool(switch: Switch, user_defaults: &UserDefaults, algorithm: Algorithm) -> Result<bool, String> {
-	if algorithm != Algorithm::Archive {
-		return Err("Fat DB is not supported with the chosen pruning option. Please rerun with `--pruning=archive`".into());
-	}
-
-	match (user_defaults.is_first_launch, switch, user_defaults.fat_db) {
+	let result = match (user_defaults.is_first_launch, switch, user_defaults.fat_db) {
 		(false, Switch::On, false) => Err("FatDB resync required".into()),
 		(_, Switch::On, _) => Ok(true),
 		(_, Switch::Off, _) => Ok(false),
 		(_, Switch::Auto, def) => Ok(def),
+	};
+
+	if result.clone().unwrap_or(false) && algorithm != Algorithm::Archive {
+		return Err("Fat DB is not supported with the chosen pruning option. Please rerun with `--pruning=archive`".into());
 	}
+	result
 }
 
 #[cfg(test)]