diff --git a/tests/expression/1.0/Android.mk b/tests/expression/1.0/Android.mk
index 08713a7..bc6b50e 100644
--- a/tests/expression/1.0/Android.mk
+++ b/tests/expression/1.0/Android.mk
@@ -64,4 +64,34 @@
 include $(BUILD_JAVA_LIBRARY)
 
 
+################################################################################
+
+include $(CLEAR_VARS)
+LOCAL_MODULE := android.hardware.tests.expression@1.0-java-static
+LOCAL_MODULE_CLASS := JAVA_LIBRARIES
+
+intermediates := $(local-generated-sources-dir)
+
+HIDL := $(HOST_OUT_EXECUTABLES)/hidl-gen$(HOST_EXECUTABLE_SUFFIX)
+
+#
+# Build IExpression.hal
+#
+GEN := $(intermediates)/android/hardware/tests/expression/1.0/IExpression.java
+$(GEN): $(HIDL)
+$(GEN): PRIVATE_HIDL := $(HIDL)
+$(GEN): PRIVATE_DEPS := $(LOCAL_PATH)/IExpression.hal
+$(GEN): PRIVATE_OUTPUT_DIR := $(intermediates)
+$(GEN): PRIVATE_CUSTOM_TOOL = \
+    $(PRIVATE_HIDL) -o $(PRIVATE_OUTPUT_DIR) \
+    -Ljava -randroid.hardware:hardware/interfaces \
+    android.hardware.tests.expression@1.0::IExpression
+
+$(GEN): $(LOCAL_PATH)/IExpression.hal
+	$(transform-generated-source)
+LOCAL_GENERATED_SOURCES += $(GEN)
+include $(BUILD_STATIC_JAVA_LIBRARY)
+
+
+
 include $(call all-makefiles-under,$(LOCAL_PATH))