diff --git a/beacon_chain/spec/presets/mainnet.nim b/beacon_chain/spec/presets/mainnet.nim
index 1ae06f5e1..bd04bbbc1 100644
--- a/beacon_chain/spec/presets/mainnet.nim
+++ b/beacon_chain/spec/presets/mainnet.nim
@@ -125,6 +125,8 @@ const
   MIN_EPOCHS_TO_INACTIVITY_PENALTY* = 2'u64^2 ##\
   ## epochs (25.6 minutes)
 
+  EARLY_DERIVED_SECRET_PENALTY_MAX_FUTURE_EPOCHS* = 16384
+
   # State vector lengths
   # ---------------------------------------------------------------
   # https://github.com/ethereum/eth2.0-specs/blob/v0.9.2/configs/mainnet.yaml#L98
@@ -180,5 +182,7 @@ const
   # https://github.com/ethereum/eth2.0-specs/blob/v0.9.4/specs/core/1_custody-game.md#constants
   # TODO those are included in minimal.yaml but not mainnet.yaml
   #      Why?
+  # EARLY_DERIVED_SECRET_PENALTY_MAX_FUTURE_EPOCHS* = 4096 # epochs
   # EPOCHS_PER_CUSTODY_PERIOD* = 4
   # CUSTODY_PERIOD_TO_RANDAO_PADDING* = 4
+
diff --git a/beacon_chain/spec/presets/minimal.nim b/beacon_chain/spec/presets/minimal.nim
index 54b3ed88f..88cf6aded 100644
--- a/beacon_chain/spec/presets/minimal.nim
+++ b/beacon_chain/spec/presets/minimal.nim
@@ -164,3 +164,4 @@ const
   EARLY_DERIVED_SECRET_PENALTY_MAX_FUTURE_EPOCHS* = 4096 # epochs
   EPOCHS_PER_CUSTODY_PERIOD* = 4
   CUSTODY_PERIOD_TO_RANDAO_PADDING* = 4
+