diff --git a/tests/hardware/Android.mk b/tests/hardware/Android.mk
index 9927343..02a3596 100644
--- a/tests/hardware/Android.mk
+++ b/tests/hardware/Android.mk
@@ -4,7 +4,7 @@
 LOCAL_MODULE := static-hal-check
 LOCAL_SRC_FILES := struct-size.cpp struct-offset.cpp struct-last.cpp
 LOCAL_SHARED_LIBRARIES := libhardware
-LOCAL_CFLAGS := -O0
+LOCAL_CFLAGS := -O0 -Wall -Werror
 
 LOCAL_C_INCLUDES += \
     system/media/camera/include
diff --git a/tests/hardware/struct-size.cpp b/tests/hardware/struct-size.cpp
index 232b55d..14a26ef 100644
--- a/tests/hardware/struct-size.cpp
+++ b/tests/hardware/struct-size.cpp
@@ -24,7 +24,7 @@
 #include <hardware/camera_common.h>
 #include <hardware/camera3.h>
 
-template<size_t> static constexpr size_t CheckSizeHelper(size_t, size_t);
+template<size_t> static constexpr size_t CheckSizeHelper(size_t, size_t) __attribute((unused));
 
 template<> constexpr size_t CheckSizeHelper<4>(size_t size32, size_t /* size64 */) {
     return size32;