diff --git a/macrovision.js b/macrovision.js
index 89893efc..4a368f1d 100644
--- a/macrovision.js
+++ b/macrovision.js
@@ -279,7 +279,7 @@ const defaultUnits = {
         metric: "liters",
         customary: "gallons",
         relative: "olympicPools",
-        volume: "barnmegaparsecs"
+        volume: "barnMegaparsecs"
     },
     mass: {
         metric: "kilograms",