diff --git a/zebra-state/src/service/check.rs b/zebra-state/src/service/check.rs
index cd5c9d33..b075a07c 100644
--- a/zebra-state/src/service/check.rs
+++ b/zebra-state/src/service/check.rs
@@ -14,9 +14,7 @@ use crate::{PreparedBlock, ValidateContextError};
 
 use super::check;
 
-use difficulty::{
-    AdjustedDifficulty, BLOCK_MAX_TIME_TESTNET_ACTIVATION_HEIGHT, POW_MEDIAN_BLOCK_SPAN,
-};
+use difficulty::{AdjustedDifficulty, POW_MEDIAN_BLOCK_SPAN, TESTNET_MAX_TIME_START_HEIGHT};
 
 pub(crate) mod difficulty;
 
@@ -150,8 +148,8 @@ fn difficulty_threshold_is_valid(
         })?
     }
 
-    // The maximum time rule is only active on Testnet from height 653606 onwards
-    if (network == Network::Mainnet || candidate_height >= BLOCK_MAX_TIME_TESTNET_ACTIVATION_HEIGHT)
+    // The maximum time rule is only active on Testnet from a specific height
+    if (network == Network::Mainnet || candidate_height >= TESTNET_MAX_TIME_START_HEIGHT)
         && candidate_time > block_time_max
     {
         Err(ValidateContextError::TimeTooLate {
diff --git a/zebra-state/src/service/check/difficulty.rs b/zebra-state/src/service/check/difficulty.rs
index cc087e94..8347baa9 100644
--- a/zebra-state/src/service/check/difficulty.rs
+++ b/zebra-state/src/service/check/difficulty.rs
@@ -45,7 +45,7 @@ pub const BLOCK_MAX_TIME_SINCE_MEDIAN: i64 = 90 * 60;
 /// The activation height for the block maximum time rule on Testnet.
 ///
 /// Part of the block header consensus rules in the Zcash specification.
-pub const BLOCK_MAX_TIME_TESTNET_ACTIVATION_HEIGHT: block::Height = block::Height(653606);
+pub const TESTNET_MAX_TIME_START_HEIGHT: block::Height = block::Height(653_606);
 
 /// Contains the context needed to calculate the adjusted difficulty for a block.
 pub(super) struct AdjustedDifficulty {