2 files changed, 6 insertions, 0 deletions
diff --git a/src/tracking/change_tracker.cc b/src/tracking/change_tracker.cc
index 1b554aa..ca07214 100644
--- a/src/tracking/change_tracker.cc
+++ b/src/tracking/change_tracker.cc
@@ -82,6 +82,8 @@ bool ChangeTracker::track(const std::string& file_path) {
 		boost::filesystem::canonical(file_path).string()
 	};
 
+	std::unique_lock<std::mutex> guard(this->write_mutex_);
+
 	auto result = this->children_.emplace(
 		full_file_path,
 		std::make_unique<boost::process::child>(
@@ -92,6 +94,8 @@ bool ChangeTracker::track(const std::string& file_path) {
 		)
 	);
 
+	guard.unlock();
+
 	if ( std::get<EMPLACE_SUCCESS>(result) ) {
 		boost::filesystem::ifstream file(
 			std::get<FILE_NAME>(*result.first)
diff --git a/src/tracking/change_tracker.h b/src/tracking/change_tracker.h
index 24251e5..e694b56 100644
--- a/src/tracking/change_tracker.h
+++ b/src/tracking/change_tracker.h
@@ -2,6 +2,7 @@
 #define CHANGE_SRC_TRACKING_CHANGE_TRACKER_H_
 
 #include <unordered_map>
+#include <mutex>
 
 #include <boost/process.hpp>
 
@@ -22,6 +23,7 @@ class ChangeTracker {
 	private:
 		const std::string      diff_cmd_;
 		utility::Logger* const logger_;
+		std::mutex             write_mutex_;
 
 		std::unordered_map<
 			std::string, std::unique_ptr<boost::process::child>