diff --git a/src/mappings/staking.ts b/src/mappings/staking.ts
index 1cd7d5e..7fff1bd 100644
--- a/src/mappings/staking.ts
+++ b/src/mappings/staking.ts
@@ -103,6 +103,7 @@ export function handleStakeLocked(event: StakeLocked): void {
   // update indexer
   let id = event.params.indexer.toHexString()
   let indexer = Indexer.load(id)!
+  let oldLockedTokens = indexer.lockedTokens
   indexer.lockedTokens = event.params.tokens
   indexer.tokensLockedUntil = event.params.until.toI32()
   indexer = updateAdvancedIndexerMetrics(indexer as Indexer)
@@ -110,9 +111,11 @@ export function handleStakeLocked(event: StakeLocked): void {
   indexer.save()
 
   // update graph network
+  // the tokens from the event replace the previously locked tokens
+  // from this indexer
   graphNetwork.totalUnstakedTokensLocked = graphNetwork.totalUnstakedTokensLocked.plus(
     event.params.tokens,
-  )
+  ).minus(oldLockedTokens)
   if (indexer.stakedTokens == indexer.lockedTokens) {
     graphNetwork.stakedIndexersCount = graphNetwork.stakedIndexersCount - 1
   }