diff --git a/juci/source.h b/juci/source.h
index 99eb436..63c7b80 100644
--- a/juci/source.h
+++ b/juci/source.h
@@ -8,6 +8,7 @@
 #include <thread>
 #include <mutex>
 #include <string>
+#include <atomic>
 #include "gtksourceviewmm.h"
 
 namespace Notebook {