diff --git a/agent-memory-client/agent_memory_client/client.py b/agent-memory-client/agent_memory_client/client.py
index 9bd521c4..d6125273 100644
--- a/agent-memory-client/agent_memory_client/client.py
+++ b/agent-memory-client/agent_memory_client/client.py
@@ -833,8 +833,8 @@ async def forget_long_term_memories(
             params["session_id"] = session_id
         if limit is not None:
             params["limit"] = limit
-        if dry_run:
-            params["dry_run"] = dry_run
+        # Always pass dry_run explicitly because the server default is True.
+        params["dry_run"] = dry_run
 
         body = {"policy": policy.model_dump(exclude_none=True)}
         if pinned_ids:
diff --git a/agent-memory-client/tests/test_client.py b/agent-memory-client/tests/test_client.py
index d6eff305..322e5d40 100644
--- a/agent-memory-client/tests/test_client.py
+++ b/agent-memory-client/tests/test_client.py
@@ -1025,6 +1025,11 @@ async def test_forget_long_term_memories_basic(self, enhanced_test_client):
         assert result.deleted == 5
         assert len(result.deleted_ids) == 5
         assert result.dry_run is False
+        enhanced_test_client._client.post.assert_called_once_with(
+            "/v1/long-term-memory/forget",
+            params={"dry_run": False},
+            json={"policy": {"max_age_days": 30}},
+        )
 
     @pytest.mark.asyncio
     async def test_forget_long_term_memories_dry_run(self, enhanced_test_client):
@@ -1048,6 +1053,11 @@ async def test_forget_long_term_memories_dry_run(self, enhanced_test_client):
 
         assert isinstance(result, ForgetResponse)
         assert result.dry_run is True
+        enhanced_test_client._client.post.assert_called_once_with(
+            "/v1/long-term-memory/forget",
+            params={"dry_run": True},
+            json={"policy": {"max_inactive_days": 14}},
+        )
 
     @pytest.mark.asyncio
     async def test_forget_long_term_memories_with_filters(self, enhanced_test_client):
@@ -1070,7 +1080,16 @@ async def test_forget_long_term_memories_with_filters(self, enhanced_test_client
         )
 
         assert isinstance(result, ForgetResponse)
-        enhanced_test_client._client.post.assert_called_once()
+        enhanced_test_client._client.post.assert_called_once_with(
+            "/v1/long-term-memory/forget",
+            params={
+                "namespace": "test-ns",
+                "user_id": "user-1",
+                "session_id": "sess-1",
+                "dry_run": False,
+            },
+            json={"policy": {"budget": 100}},
+        )
 
 
 # ==================== Summary Views Tests ====================