diff --git a/ets2panda/compiler/scripts/signatures.yaml b/ets2panda/compiler/scripts/signatures.yaml
index 2e06978b5f8f1d2babe90f3bf4eae22d46b57199..cc8dd313ee1e9dfb8210bba21b7fcd521381cd59 100644
--- a/ets2panda/compiler/scripts/signatures.yaml
+++ b/ets2panda/compiler/scripts/signatures.yaml
@@ -32,7 +32,7 @@ defines:
     ref: SET_INDEX_METHOD
   - name: $_iterator
     ref: ITERATOR_METHOD
-  - name: Iterator 
+  - name: Iterator
     ref: ITERATOR_CLASS
   - name: 'ambient_indexer'
     ref: AMBIENT_INDEXER
@@ -402,7 +402,7 @@ builtins:
     package: PKG_ESCOMPAT
     ref: BUILTIN_ERROR_OPTIONS
   - name: BigInt
-    package: PKG_ESCOMPAT
+    package: PKG_STD_CORE
     ref: BUILTIN_BIGINT
   - name: Array
     package: PKG_ESCOMPAT