diff --git a/tests/security/test-sec-tpm-osx.cpp b/tests/security/test-sec-tpm-osx.cpp
index f8df5e8..887b19c 100644
--- a/tests/security/test-sec-tpm-osx.cpp
+++ b/tests/security/test-sec-tpm-osx.cpp
@@ -15,6 +15,8 @@
 
 #include "util/time.hpp"
 
+#include <boost/lexical_cast.hpp>
+
 #include "boost-test.hpp"
 
 using namespace std;