diff --git a/chromecast/media/cma/backend/mixer/post_processors/governor_unittest.cc b/chromecast/media/cma/backend/mixer/post_processors/governor_unittest.cc
index 2494daf18aa992..140255d0c6adfa 100644
--- a/chromecast/media/cma/backend/mixer/post_processors/governor_unittest.cc
+++ b/chromecast/media/cma/backend/mixer/post_processors/governor_unittest.cc
@@ -22,7 +22,7 @@ namespace post_processor_test {
 
 namespace {
 
-const char* kConfigTemplate =
+constexpr char kConfigTemplate[] =
     R"config({"onset_volume": %f, "clamp_multiplier": %f})config";
 
 const float kDefaultClamp = 0.6f;