diff --git a/specs/core/0_beacon-chain.md b/specs/core/0_beacon-chain.md
index a6a9385c80..48075c8d4f 100644
--- a/specs/core/0_beacon-chain.md
+++ b/specs/core/0_beacon-chain.md
@@ -199,7 +199,7 @@ Code snippets appearing in `this style` are to be interpreted as Python code. Be
 | Name | Value |
 | - | - |
 | `GENESIS_FORK_VERSION` | `0` |
-| `GENESIS_SLOT` | `2**19` |
+| `GENESIS_SLOT` | `2**63` |
 | `GENESIS_EPOCH` | `slot_to_epoch(GENESIS_SLOT)` |
 | `GENESIS_START_SHARD` | `0` |
 | `FAR_FUTURE_EPOCH` | `2**64 - 1` |