1 files changed, 4 insertions, 0 deletions
diff --git a/src/modules/AuthBackendChallengeResponse/AuthBackendChallengeResponse.h b/src/modules/AuthBackendChallengeResponse/AuthBackendChallengeResponse.h
index a32cc98..dc1b60a 100644
--- a/src/modules/AuthBackendChallengeResponse/AuthBackendChallengeResponse.h
+++ b/src/modules/AuthBackendChallengeResponse/AuthBackendChallengeResponse.h
@@ -33,6 +33,8 @@
 #include <boost/random/uniform_int.hpp>
 #include <boost/random/variate_generator.hpp>
 
+#include <boost/thread/mutex.hpp>
+
 namespace Mad {
 namespace Modules {
 namespace AuthBackendChallengeResponse {
@@ -58,6 +60,8 @@ class MAD_MODULE_EXPORT AuthBackendChallengeResponse : public Common::AuthBacken
 
     Common::Application *application;
 
+    boost::mutex mutex;
+
     boost::mt19937 rng;
     boost::uniform_int<boost::uint8_t> byteDistribution;
     boost::variate_generator<boost::mt19937&, boost::uniform_int<boost::uint8_t> > randomGenerator;