diff --git a/internal/federation/federatingdb/create.go b/internal/federation/federatingdb/create.go
index cdd725c05..11030b16b 100644
--- a/internal/federation/federatingdb/create.go
+++ b/internal/federation/federatingdb/create.go
@@ -65,7 +65,7 @@ func (f *federatingDB) Create(ctx context.Context, asType vocab.Type) error {
 
 	// Cache entry for this create activity ID for later
 	// checks in the Exist() function if we see it again.
-	f.createdIDs.Set(ap.GetJSONLDId(asType).String(), struct{}{})
+	f.activityIDs.Set(ap.GetJSONLDId(asType).String(), struct{}{})
 
 	switch name := asType.GetTypeName(); name {
 	case ap.ActivityBlock:
diff --git a/internal/federation/federatingdb/db.go b/internal/federation/federatingdb/db.go
index 300f48c56..cd5110923 100644
--- a/internal/federation/federatingdb/db.go
+++ b/internal/federation/federatingdb/db.go
@@ -65,7 +65,7 @@ type federatingDB struct {
 
 	// tracks Activity IDs we have handled creates for,
 	// for use in the Exists() function during forwarding.
-	createdIDs simple.Cache[string, struct{}]
+	activityIDs simple.Cache[string, struct{}]
 }
 
 // New returns a DB that satisfies the pub.Database
@@ -84,6 +84,6 @@ func New(
 		intFilter:  intFilter,
 		spamFilter: spamFilter,
 	}
-	fdb.createdIDs.Init(0, 1000)
+	fdb.activityIDs.Init(0, 1000)
 	return &fdb
 }
diff --git a/internal/federation/federatingdb/exists.go b/internal/federation/federatingdb/exists.go
index c707baa54..ec996f72f 100644
--- a/internal/federation/federatingdb/exists.go
+++ b/internal/federation/federatingdb/exists.go
@@ -25,5 +25,5 @@ import (
 // Exists is an implementation of pub.Database{}.Exists(), optimized specifically for
 // the only usecase in which go-fed/activity/pub actually calls it. Do not use otherwise!
 func (f *federatingDB) Exists(ctx context.Context, id *url.URL) (exists bool, err error) {
-	return f.createdIDs.Has(id.String()), nil
+	return f.activityIDs.Has(id.String()), nil
 }