diff --git a/packages/nimiq-supply-calculator/src/constants.ts b/packages/nimiq-supply-calculator/src/constants.ts
index 41e3c93..6a93fcd 100644
--- a/packages/nimiq-supply-calculator/src/constants.ts
+++ b/packages/nimiq-supply-calculator/src/constants.ts
@@ -16,7 +16,7 @@ export const PROOF_OF_STAKE_FORK_DATE = new Date('2024-11-19T16:45:20.000Z')
  * Same as:
  * powSupplyAfter(powBlockHeightAt(PROOF_OF_STAKE_FORK_DATE))
  */
-export const SUPPLY_AT_PROOF_OF_STAKE_FORK_DATE = 12_893_109_654_06244
+export const SUPPLY_AT_PROOF_OF_STAKE_FORK_DATE = 12_893_109_654.06244
 
 /**
  * The total supply of the cryptocurrency in **Testnet** at the proof-of-stake fork date, in NIM.
@@ -24,7 +24,7 @@ export const SUPPLY_AT_PROOF_OF_STAKE_FORK_DATE = 12_893_109_654_06244
  * Same as:
  * powSupplyAfter(powBlockHeightAt(PROOF_OF_STAKE_FORK_DATE))
  */
-export const SUPPLY_AT_PROOF_OF_STAKE_FORK_DATE_TESTNET = 12_030_755_339_52899
+export const SUPPLY_AT_PROOF_OF_STAKE_FORK_DATE_TESTNET = 12_030_755_339.52899
 
 /**
  * The block height of the proof-of-stake fork.
diff --git a/packages/nimiq-supply-calculator/src/pos.ts b/packages/nimiq-supply-calculator/src/pos.ts
index 9c11d86..edb5eeb 100644
--- a/packages/nimiq-supply-calculator/src/pos.ts
+++ b/packages/nimiq-supply-calculator/src/pos.ts
@@ -12,6 +12,7 @@ const SUPPLY_DECAY = 0.9999999999960264
 export function posSupplyAt(timestampMs: number): number {
   const ts = timestampMs - PROOF_OF_STAKE_FORK_DATE.getTime()
   if (ts < 0)
-    throw new Error('currentTime must be greater or equal to genesisTime')
-  return (TOTAL_SUPPLY - ((TOTAL_SUPPLY - SUPPLY_AT_PROOF_OF_STAKE_FORK_DATE * 1e5) * powi(SUPPLY_DECAY, ts)))
+    throw new Error(`Invalid timestamp: ${timestampMs}. It must be greater than ${PROOF_OF_STAKE_FORK_DATE.getTime()}.`)
+
+  return (TOTAL_SUPPLY - ((TOTAL_SUPPLY - SUPPLY_AT_PROOF_OF_STAKE_FORK_DATE * 1e5) * powi(SUPPLY_DECAY, ts))) * 1e5
 }