diff --git a/core/src/config.h b/core/src/config.h
index 697e460..7fbbbe9 100644
--- a/core/src/config.h
+++ b/core/src/config.h
@@ -3,6 +3,7 @@
 #include <thread>
 #include <string>
 #include <mutex>
+#include <condition_variable>
 
 using nlohmann::json;