diff --git a/lightning/src/routing/scoring.rs b/lightning/src/routing/scoring.rs
index 8bbeb569c7a..0c78783c0cf 100644
--- a/lightning/src/routing/scoring.rs
+++ b/lightning/src/routing/scoring.rs
@@ -1207,7 +1207,7 @@ fn success_probability(
 		// Note that we prefer to increase the denominator rather than decrease the numerator as
 		// the denominator is more likely to be larger and thus provide greater precision. This is
 		// mostly an overoptimization but makes a large difference in tests.
-		denominator = denominator * 21 / 16
+		denominator = denominator * 81 / 64
 	}
 
 	(numerator, denominator)