2 files changed, 3 insertions, 0 deletions
diff --git a/src/lib/entropy/proc_walk/proc_walk.cpp b/src/lib/entropy/proc_walk/proc_walk.cpp
index 95dc4e8e3..616c76ea3 100644
--- a/src/lib/entropy/proc_walk/proc_walk.cpp
+++ b/src/lib/entropy/proc_walk/proc_walk.cpp
@@ -120,6 +120,8 @@ void ProcWalking_EntropySource::poll(Entropy_Accumulator& accum)
    const size_t MAX_FILES_READ_PER_POLL = 2048;
    const double ENTROPY_ESTIMATE = 1.0 / (8*1024);
 
+   std::lock_guard<std::mutex> lock(m_mutex);
+
    if(!m_dir)
       m_dir.reset(new Directory_Walker(m_path));
 
diff --git a/src/lib/entropy/proc_walk/proc_walk.h b/src/lib/entropy/proc_walk/proc_walk.h
index 047fb3bb9..218cd752a 100644
--- a/src/lib/entropy/proc_walk/proc_walk.h
+++ b/src/lib/entropy/proc_walk/proc_walk.h
@@ -34,6 +34,7 @@ class ProcWalking_EntropySource : public EntropySource
 
    private:
       const std::string m_path;
+      std::mutex m_mutex;
       std::unique_ptr<File_Descriptor_Source> m_dir;
    };