diff --git a/recipes/engine/engine_unopt.expected/linux.json b/recipes/engine/engine_unopt.expected/linux.json
index bc3c744..8369a9f 100644
--- a/recipes/engine/engine_unopt.expected/linux.json
+++ b/recipes/engine/engine_unopt.expected/linux.json
@@ -645,6 +645,7 @@
       "--unoptimized",
       "--prebuilt-dart-sdk",
       "--asan",
+      "--lsan",
       "--dart-debug",
       "--no-lto"
     ],
@@ -681,7 +682,7 @@
         "hostname": "rdbhost"
       }
     },
-    "name": "gn --runtime-mode debug --unoptimized --prebuilt-dart-sdk --asan --dart-debug --no-lto"
+    "name": "gn --runtime-mode debug --unoptimized --prebuilt-dart-sdk --asan --lsan --dart-debug --no-lto"
   },
   {
     "cmd": [],
diff --git a/recipes/engine/engine_unopt.expected/linux_lto.json b/recipes/engine/engine_unopt.expected/linux_lto.json
index 542d61f..11fd285 100644
--- a/recipes/engine/engine_unopt.expected/linux_lto.json
+++ b/recipes/engine/engine_unopt.expected/linux_lto.json
@@ -645,6 +645,7 @@
       "--unoptimized",
       "--prebuilt-dart-sdk",
       "--asan",
+      "--lsan",
       "--dart-debug"
     ],
     "cwd": "[CACHE]/builder",
@@ -680,7 +681,7 @@
         "hostname": "rdbhost"
       }
     },
-    "name": "gn --runtime-mode debug --unoptimized --prebuilt-dart-sdk --asan --dart-debug"
+    "name": "gn --runtime-mode debug --unoptimized --prebuilt-dart-sdk --asan --lsan --dart-debug"
   },
   {
     "cmd": [],
diff --git a/recipes/engine/engine_unopt.py b/recipes/engine/engine_unopt.py
index 475ba5f..aa1832e 100644
--- a/recipes/engine/engine_unopt.py
+++ b/recipes/engine/engine_unopt.py
@@ -135,6 +135,7 @@
       '--unoptimized',
       '--prebuilt-dart-sdk',
       '--asan',
+      '--lsan',
       '--dart-debug'
   )
   Build(api, 'host_debug_unopt')