diff --git a/resolver_unittest.cc b/resolver_unittest.cc
index 0f9d6ef..a5ee72d 100644
--- a/resolver_unittest.cc
+++ b/resolver_unittest.cc
@@ -12,6 +12,7 @@
 
 #include "shill/mock_control.h"
 
+using base::FilePath;
 using std::string;
 using std::vector;
 using testing::Test;