diff --git a/.changeset/small-socks-lay.md b/.changeset/small-socks-lay.md
new file mode 100644
index 000000000..5b45526b6
--- /dev/null
+++ b/.changeset/small-socks-lay.md
@@ -0,0 +1,5 @@
+---
+'@powersync/service-core': patch
+---
+
+Fix reported metrics for storage size > 2GB.
diff --git a/packages/service-core/src/storage/MongoBucketStorage.ts b/packages/service-core/src/storage/MongoBucketStorage.ts
index 3033122ca..e4a492bd2 100644
--- a/packages/service-core/src/storage/MongoBucketStorage.ts
+++ b/packages/service-core/src/storage/MongoBucketStorage.ts
@@ -347,9 +347,9 @@ export class MongoBucketStorage
       .catch(ignoreNotExiting);
 
     return {
-      operations_size_bytes: operations_aggregate[0].storageStats.size,
-      parameters_size_bytes: parameters_aggregate[0].storageStats.size,
-      replication_size_bytes: replication_aggregate[0].storageStats.size
+      operations_size_bytes: Number(operations_aggregate[0].storageStats.size),
+      parameters_size_bytes: Number(parameters_aggregate[0].storageStats.size),
+      replication_size_bytes: Number(replication_aggregate[0].storageStats.size)
     };
   }