diff --git a/libwvdrmengine/cdm/metrics/include/field_tuples.h b/libwvdrmengine/cdm/metrics/include/field_tuples.h
index 40d964c0..307d7def 100644
--- a/libwvdrmengine/cdm/metrics/include/field_tuples.h
+++ b/libwvdrmengine/cdm/metrics/include/field_tuples.h
@@ -94,7 +94,8 @@ inline void AppendFieldNames(std::vector<std::string>* field_name_vector,
 template <bool>
 struct CompileAssert {};
 #define COMPILE_ASSERT(expr, msg) \
-  typedef util::CompileAssert<(bool(expr))> msg[bool(expr) ? 1 : -1]
+  typedef util::CompileAssert<(bool(expr))> msg[bool(expr) ? 1 : -1] \
+  __attribute__((unused))
 
 template <typename T> struct is_unused { static const bool value = false; };
 template <> struct is_unused<Unused> { static const bool value = true; };
@@ -125,4 +126,3 @@ class FirstUnusedType {
 }  // namespace wvcdm
 
 #endif  // WVCDM_METRICS_FIELD_TUPLES_H_
-