diff --git a/zebra-chain/src/parameters/network_upgrade.rs b/zebra-chain/src/parameters/network_upgrade.rs
index dd7b7facb..989f9b112 100644
--- a/zebra-chain/src/parameters/network_upgrade.rs
+++ b/zebra-chain/src/parameters/network_upgrade.rs
@@ -264,7 +264,7 @@ impl NetworkUpgrade {
     ///
     /// `AveragingWindowTimespan` from the Zcash specification.
     pub fn averaging_window_timespan(&self) -> Duration {
-        self.target_spacing() * POW_AVERAGING_WINDOW as _
+        self.target_spacing() * (POW_AVERAGING_WINDOW as _)
     }
 
     /// Returns the averaging window timespan for `network` and `height`.