diff --git a/pkg/dev_compiler/test/modular_suite.dart b/pkg/dev_compiler/test/modular_suite.dart
index 2442d93cc01..0b4e1e6e81b 100644
--- a/pkg/dev_compiler/test/modular_suite.dart
+++ b/pkg/dev_compiler/test/modular_suite.dart
@@ -81,6 +81,9 @@ class SourceToSummaryDillStep implements IOModularStep {
       extraArgs = ['--packages-file', '$rootScheme:/.packages'];
     }
 
+    Module sdkModule =
+        module.isSdk ? module : module.dependencies.firstWhere((m) => m.isSdk);
+
     List<String> args = [
       _kernelWorkerScript,
       '--summary-only',
@@ -93,8 +96,14 @@ class SourceToSummaryDillStep implements IOModularStep {
       ...extraArgs,
       '--output',
       '${toUri(module, dillId)}',
+      if (!module.isSdk) ...[
+        '--dart-sdk-summary',
+        '${toUri(sdkModule, dillId)}',
+        '--exclude-non-sources',
+      ],
       ...(transitiveDependencies
-          .expand((m) => ['--input-linked', '${toUri(m, dillId)}'])),
+          .where((m) => !m.isSdk)
+          .expand((m) => ['--input-summary', '${toUri(m, dillId)}'])),
       ...(sources.expand((String uri) => ['--source', uri])),
       ...(flags.expand((String flag) => ['--enable-experiment', flag])),
     ];
diff --git a/tests/modular/diamond/a.dart b/tests/modular/diamond/a.dart
new file mode 100644
index 00000000000..63956ec64e8
--- /dev/null
+++ b/tests/modular/diamond/a.dart
@@ -0,0 +1,3 @@
+import 'b.dart';
+
+var item = b;
diff --git a/tests/modular/diamond/b.dart b/tests/modular/diamond/b.dart
new file mode 100644
index 00000000000..07a55aa41a4
--- /dev/null
+++ b/tests/modular/diamond/b.dart
@@ -0,0 +1,3 @@
+class B {}
+
+var b = new B();
diff --git a/tests/modular/diamond/main.dart b/tests/modular/diamond/main.dart
new file mode 100644
index 00000000000..a112564e81b
--- /dev/null
+++ b/tests/modular/diamond/main.dart
@@ -0,0 +1,6 @@
+import 'b.dart';
+import 'a.dart';
+
+main() {
+  print([item, b]);
+}
diff --git a/tests/modular/diamond/modules.yaml b/tests/modular/diamond/modules.yaml
new file mode 100644
index 00000000000..2fd373c2ed8
--- /dev/null
+++ b/tests/modular/diamond/modules.yaml
@@ -0,0 +1,3 @@
+dependencies:
+  main: [a, b]
+  a: b