diff --git a/pkg/front_end/lib/src/fasta/builder/declaration.dart b/pkg/front_end/lib/src/fasta/builder/declaration.dart
index fa1f97b1ae7..f68699ee9cf 100644
--- a/pkg/front_end/lib/src/fasta/builder/declaration.dart
+++ b/pkg/front_end/lib/src/fasta/builder/declaration.dart
@@ -4,9 +4,7 @@
 
 library fasta.declaration;
 
-import '../problems.dart' show unhandled, unsupported;
-
-import 'library_builder.dart' show LibraryBuilder;
+import '../problems.dart' show unsupported;
 
 abstract class Declaration {
   /// Used when multiple things with the same name are declared within the same
@@ -62,15 +60,6 @@ abstract class Declaration {
 
   bool get isTypeVariable => false;
 
-  Uri computeLibraryUri() {
-    Declaration declaration = this;
-    do {
-      if (declaration is LibraryBuilder) return declaration.uri;
-      declaration = declaration.parent;
-    } while (declaration != null);
-    return unhandled("no library parent", "${runtimeType}", -1, null);
-  }
-
   /// Applies [patch] to this declaration.
   void applyPatch(Declaration patch) {
     unsupported("${runtimeType}.applyPatch", charOffset, fileUri);
diff --git a/pkg/front_end/lib/src/fasta/kernel/kernel_library_builder.dart b/pkg/front_end/lib/src/fasta/kernel/kernel_library_builder.dart
index 34ab1901c29..c5291dfc85b 100644
--- a/pkg/front_end/lib/src/fasta/kernel/kernel_library_builder.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/kernel_library_builder.dart
@@ -890,10 +890,10 @@ class KernelLibraryBuilder
     if (scope.local[name] == declaration) {
       isLocal = true;
       preferred = declaration;
-      hiddenUri = other.computeLibraryUri();
+      hiddenUri = computeLibraryUri(other);
     } else {
-      uri = declaration.computeLibraryUri();
-      otherUri = other.computeLibraryUri();
+      uri = computeLibraryUri(declaration);
+      otherUri = computeLibraryUri(other);
       if (declaration is LoadLibraryBuilder) {
         isLoadLibrary = true;
         preferred = declaration;
@@ -1139,3 +1139,13 @@ class KernelLibraryBuilder
     addToExportScope(name, member);
   }
 }
+
+Uri computeLibraryUri(Declaration declaration) {
+  Declaration current = declaration;
+  do {
+    if (current is LibraryBuilder) return current.uri;
+    current = current.parent;
+  } while (current != null);
+  return unhandled("no library parent", "${declaration.runtimeType}",
+      declaration.charOffset, declaration.fileUri);
+}