diff --git a/pkg/kernel/lib/ast.dart b/pkg/kernel/lib/ast.dart
index d738ec503c6..2da3cd52561 100644
--- a/pkg/kernel/lib/ast.dart
+++ b/pkg/kernel/lib/ast.dart
@@ -155,8 +155,6 @@ abstract class TreeNode extends Node {
 
   Component get enclosingComponent => parent?.enclosingComponent;
 
-  Library get enclosingLibrary => parent?.enclosingLibrary;
-
   /// Returns the best known source location of the given AST node, or `null` if
   /// the node is orphaned.
   ///
@@ -468,8 +466,6 @@ class Library extends NamedNode implements Comparable<Library>, FileUriNode {
   Location _getLocationInEnclosingFile(int offset) {
     return _getLocationInComponent(enclosingComponent, fileUri, offset);
   }
-
-  Library get enclosingLibraray => this;
 }
 
 /// An import or export declaration in a library.
diff --git a/pkg/vm/lib/transformations/ffi_use_sites.dart b/pkg/vm/lib/transformations/ffi_use_sites.dart
index 8e9227caba1..178de15f4c2 100644
--- a/pkg/vm/lib/transformations/ffi_use_sites.dart
+++ b/pkg/vm/lib/transformations/ffi_use_sites.dart
@@ -46,6 +46,8 @@ class _FfiUseSiteTransformer extends FfiTransformer {
   final Map<Field, Procedure> replacedGetters;
   final Map<Field, Procedure> replacedSetters;
 
+  bool isFfiLibrary;
+
   _FfiUseSiteTransformer(
       ClassHierarchy hierarchy,
       CoreTypes coreTypes,
@@ -54,6 +56,12 @@ class _FfiUseSiteTransformer extends FfiTransformer {
       this.replacedSetters)
       : super(hierarchy, coreTypes, diagnosticReporter) {}
 
+  @override
+  TreeNode visitLibrary(Library node) {
+    isFfiLibrary = node == ffiLibrary;
+    return super.visitLibrary(node);
+  }
+
   @override
   visitClass(Class node) {
     env.thisType = InterfaceType(node);
@@ -124,7 +132,7 @@ class _FfiUseSiteTransformer extends FfiTransformer {
         _ensureNativeTypeValid(nativeType, node);
         _ensureNativeTypeToDartType(nativeType, dartType, node);
       } else if (target == asFunctionMethod) {
-        if (node.enclosingLibrary == ffiLibrary) {
+        if (isFfiLibrary) {
           // Library code of dart:ffi uses asFunction to implement
           // lookupFunction. Since we treat lookupFunction as well, this call
           // can be generic and still support AOT.