diff --git a/updater/Android.bp b/updater/Android.bp
index 8a60ef7..cbef430 100644
--- a/updater/Android.bp
+++ b/updater/Android.bp
@@ -13,11 +13,7 @@
 // limitations under the License.
 
 cc_defaults {
-    name: "libupdater_defaults",
-
-    defaults: [
-        "recovery_defaults",
-    ],
+    name: "libupdater_static_libs",
 
     static_libs: [
         "libapplypatch",
@@ -45,6 +41,15 @@
         "libcutils",
         "libutils",
     ],
+}
+
+cc_defaults {
+    name: "libupdater_defaults",
+
+    defaults: [
+        "recovery_defaults",
+        "libupdater_static_libs",
+    ],
 
     shared_libs: [
         "libcrypto",
@@ -64,7 +69,7 @@
         "libext2_uuid",
         "libext2_e2p",
         "libext2fs",
-    ]
+    ],
 }
 
 cc_library_static {
@@ -155,3 +160,29 @@
         "include",
     ],
 }
+
+cc_binary_host {
+    name: "update_host_simulator",
+    defaults: ["libupdater_static_libs"],
+
+    srcs: ["update_simulator_main.cpp"],
+
+    cflags: [
+        "-Wall",
+        "-Werror",
+    ],
+
+    static_libs: [
+        "libupdater_host",
+        "libupdater_core",
+        "libcrypto_static",
+        "libfstab",
+        "libc++fs",
+    ],
+
+    target: {
+        darwin: {
+            enabled: false,
+        },
+    },
+}
diff --git a/updater/Android.mk b/updater/Android.mk
index 6f54d89..8a4cd86 100644
--- a/updater/Android.mk
+++ b/updater/Android.mk
@@ -111,32 +111,3 @@
 LOCAL_FORCE_STATIC_EXECUTABLE := true
 
 include $(BUILD_EXECUTABLE)
-
-# TODO(xunchang) move to bp file
-# update_host_simulator (host executable)
-# ===============================
-include $(CLEAR_VARS)
-
-LOCAL_MODULE := update_host_simulator
-LOCAL_MODULE_HOST_OS := linux
-
-LOCAL_SRC_FILES := \
-    update_simulator_main.cpp
-
-LOCAL_C_INCLUDES := \
-    $(LOCAL_PATH)/include
-
-LOCAL_CFLAGS := \
-    -Wall \
-    -Werror
-
-LOCAL_STATIC_LIBRARIES := \
-    libupdater_host \
-    libupdater_core \
-    $(updater_common_static_libraries) \
-    libfstab \
-    libc++fs
-
-LOCAL_MODULE_CLASS := EXECUTABLES
-
-include $(BUILD_HOST_EXECUTABLE)