--- a/flutter/fml/cpu_affinity.cc
+++ b/flutter/fml/cpu_affinity.cc
@@ -4,6 +4,7 @@
 
 #include "flutter/fml/cpu_affinity.h"
 #include "flutter/fml/build_config.h"
+#include "flutter/fml/logging.h"
 
 #include <cstdint>
 #include <fstream>
@@ -83,6 +84,7 @@ const std::vector<size_t>& CPUSpeedTracke
     case CpuAffinity::kNotEfficiency:
       return not_efficiency_;
   }
+  FML_UNREACHABLE();
 }
 
 // Get the size of the cpuinfo file by reading it until the end. This is