diff --git a/gitnexus/test/fixtures/lang-resolution/rust-dyn-trait-object/src/lib.rs b/gitnexus/test/fixtures/lang-resolution/rust-dyn-trait-object/src/lib.rs
new file mode 100644
index 000000000..d25dad83d
--- /dev/null
+++ b/gitnexus/test/fixtures/lang-resolution/rust-dyn-trait-object/src/lib.rs
@@ -0,0 +1,15 @@
+pub trait Behaviour {
+    fn trait_target(&self) -> u32;
+}
+
+pub struct Impl1;
+
+impl Behaviour for Impl1 {
+    fn trait_target(&self) -> u32 {
+        7
+    }
+}
+
+pub fn calls_via_dyn(b: &dyn Behaviour) -> u32 {
+    b.trait_target()
+}
diff --git a/gitnexus/test/integration/resolvers/rust.test.ts b/gitnexus/test/integration/resolvers/rust.test.ts
index 9cd4f94e8..87aa6899b 100644
--- a/gitnexus/test/integration/resolvers/rust.test.ts
+++ b/gitnexus/test/integration/resolvers/rust.test.ts
@@ -1951,6 +1951,29 @@ describe('Rust abstract dispatch (Repository trait)', () => {
   });
 });
 
+// ---------------------------------------------------------------------------
+// #2604: trait-object (&dyn Trait) receiver dispatch
+// ---------------------------------------------------------------------------
+
+describe('Rust dyn trait-object dispatch (#2604)', () => {
+  let result: PipelineResult;
+
+  beforeAll(async () => {
+    result = await runPipelineFromRepo(path.join(FIXTURES, 'rust-dyn-trait-object'), () => {});
+  }, 60000);
+
+  it('detects Impl1 struct and Behaviour trait', () => {
+    expect(getNodesByLabel(result, 'Struct')).toContain('Impl1');
+    expect(getNodesByLabel(result, 'Trait')).toContain('Behaviour');
+  });
+
+  it('emits exactly one CALLS edge from calls_via_dyn(b: &dyn Behaviour) to trait_target', () => {
+    const calls = getRelationships(result, 'CALLS');
+    const dynCalls = calls.filter((c) => c.source === 'calls_via_dyn' && c.target === 'trait_target');
+    expect(dynCalls.length).toBe(1);
+  });
+});
+
 // ---------------------------------------------------------------------------
 // SM-11: Rust Child extends Parent — qualified-syntax MRO
 //