diff --git a/pkg/front_end/lib/src/fasta/kernel/kernel_target.dart b/pkg/front_end/lib/src/fasta/kernel/kernel_target.dart
index 4cf5f7e..437924c 100644
--- a/pkg/front_end/lib/src/fasta/kernel/kernel_target.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/kernel_target.dart
@@ -386,6 +386,7 @@
       await loader.buildOutlines();
       loader.coreLibrary.becomeCoreLibrary();
       loader.resolveParts();
+      loader.computeMacroDeclarations();
       loader.computeLibraryScopes();
       setupTopAndBottomTypes();
       loader.resolveTypes();
@@ -394,7 +395,6 @@
           dynamicType, nullType, bottomType, objectClassBuilder);
       List<SourceClassBuilder> sourceClassBuilders =
           loader.checkSemantics(objectClassBuilder);
-      loader.computeMacroDeclarations(sourceClassBuilders);
       loader.computeMacroApplications();
       loader.finishTypeVariables(objectClassBuilder, dynamicType);
       loader.createTypeInferenceEngine();
diff --git a/pkg/front_end/lib/src/fasta/source/source_loader.dart b/pkg/front_end/lib/src/fasta/source/source_loader.dart
index 6c12705..48f3241 100644
--- a/pkg/front_end/lib/src/fasta/source/source_loader.dart
+++ b/pkg/front_end/lib/src/fasta/source/source_loader.dart
@@ -1303,7 +1303,7 @@
     ticker.logMs("Resolved $typeCount types");
   }
 
-  void computeMacroDeclarations(List<SourceClassBuilder> sourceClassBuilders) {
+  void computeMacroDeclarations() {
     if (!enableMacros) return;
 
     LibraryBuilder? macroLibraryBuilder = lookupLibraryBuilder(macroLibraryUri);
@@ -1325,14 +1325,18 @@
     Set<ClassBuilder> macroClasses = {macroClassBuilder};
     Set<Uri> macroLibraries = {macroLibraryBuilder.importUri};
 
-    for (SourceClassBuilder sourceClassBuilder in sourceClassBuilders) {
-      if (sourceClassBuilder.isMacro) {
-        macroClasses.add(sourceClassBuilder);
-        macroLibraries.add(sourceClassBuilder.library.importUri);
-        if (retainDataForTesting) {
-          (dataForTesting!.macroDeclarationData.macroDeclarations[
-                  sourceClassBuilder.library.importUri] ??= [])
-              .add(sourceClassBuilder.name);
+    for (SourceLibraryBuilder sourceLibraryBuilder in sourceLibraryBuilders) {
+      Iterator<Builder> iterator = sourceLibraryBuilder.iterator;
+      while (iterator.moveNext()) {
+        Builder builder = iterator.current;
+        if (builder is SourceClassBuilder && builder.isMacro) {
+          macroClasses.add(builder);
+          macroLibraries.add(builder.library.importUri);
+          if (retainDataForTesting) {
+            (dataForTesting!.macroDeclarationData
+                    .macroDeclarations[builder.library.importUri] ??= [])
+                .add(builder.name);
+          }
         }
       }
     }