diff --git a/configs/mainnet.yaml b/configs/mainnet.yaml
index af446d575..4096b43b8 100644
--- a/configs/mainnet.yaml
+++ b/configs/mainnet.yaml
@@ -17,8 +17,8 @@ MIN_PER_EPOCH_CHURN_LIMIT: 4
 CHURN_LIMIT_QUOTIENT: 65536
 # See issue 563
 SHUFFLE_ROUND_COUNT: 90
-# `2**16` (= 65,536)
-MIN_GENESIS_ACTIVE_VALIDATOR_COUNT: 65536
+# `2**14` (= 16,384)
+MIN_GENESIS_ACTIVE_VALIDATOR_COUNT: 16384
 # Jan 3, 2020
 MIN_GENESIS_TIME: 1578009600
 
diff --git a/specs/core/0_beacon-chain.md b/specs/core/0_beacon-chain.md
index 540d8192d..5707c6157 100644
--- a/specs/core/0_beacon-chain.md
+++ b/specs/core/0_beacon-chain.md
@@ -171,7 +171,7 @@ The following values are (non-configurable) constants used throughout the specif
 | `MIN_PER_EPOCH_CHURN_LIMIT` | `2**2` (= 4) |
 | `CHURN_LIMIT_QUOTIENT` | `2**16` (= 65,536) |
 | `SHUFFLE_ROUND_COUNT` | `90` |
-| `MIN_GENESIS_ACTIVE_VALIDATOR_COUNT` | `2**16` (= 65,536) |
+| `MIN_GENESIS_ACTIVE_VALIDATOR_COUNT` | `2**14` (= 16,384) |
 | `MIN_GENESIS_TIME` | `1578009600` (Jan 3, 2020) |
 
 - For the safety of committees, `TARGET_COMMITTEE_SIZE` exceeds [the recommended minimum committee size of 111](https://vitalik.ca/files/Ithaca201807_Sharding.pdf); with sufficient active validators (at least `SLOTS_PER_EPOCH * TARGET_COMMITTEE_SIZE`), the shuffling algorithm ensures committee sizes of at least `TARGET_COMMITTEE_SIZE`. (Unbiasable randomness with a Verifiable Delay Function (VDF) will improve committee robustness and lower the safe minimum committee size.)