diff --git a/lightning/src/routing/scoring.rs b/lightning/src/routing/scoring.rs
index 6dcba095c98..f13657d73d9 100644
--- a/lightning/src/routing/scoring.rs
+++ b/lightning/src/routing/scoring.rs
@@ -403,7 +403,7 @@ pub struct ProbabilisticScoringParameters {
 	/// If you wish to avoid creating paths with such channels entirely, setting this to a value of
 	/// `u64::max_value()` will guarantee that.
 	///
-	/// Default value: `u64::max_value()`
+	/// Default value: 1_0000_0000_000 msat (1 Bitcoin)
 	pub considered_impossible_penalty_msat: u64,
 }
 
@@ -545,7 +545,7 @@ impl Default for ProbabilisticScoringParameters {
 			amount_penalty_multiplier_msat: 256,
 			banned_nodes: HashSet::new(),
 			anti_probing_penalty_msat: 250,
-			considered_impossible_penalty_msat: u64::max_value(),
+			considered_impossible_penalty_msat: 1_0000_0000_000,
 		}
 	}
 }
@@ -2162,7 +2162,10 @@ mod tests {
 	fn accounts_for_inflight_htlc_usage() {
 		let logger = TestLogger::new();
 		let network_graph = network_graph(&logger);
-		let params = ProbabilisticScoringParameters::default();
+		let params = ProbabilisticScoringParameters {
+			considered_impossible_penalty_msat: u64::max_value(),
+			..ProbabilisticScoringParameters::zero_penalty()
+		};
 		let scorer = ProbabilisticScorer::new(params, &network_graph, &logger);
 		let source = source_node_id();
 		let target = target_node_id();