diff --git a/nav.py b/nav.py
index 2cab8f5..80d0770 100644
--- a/nav.py
+++ b/nav.py
@@ -26,7 +26,7 @@ DISTANCES = {
     ("ganymede", "callisto"): 0.8,
     ("europa", "titan"): 655.0,
     ("titan", "enceladus"): 1.0,
-    ("titan", "pluto"): 4400.0,
+    ("titan", "pluto"): 4387.0,
 }
 
 # Every route starts at Earth.