diff --git a/lldb/include/lldb/Host/JSONTransport.h b/lldb/include/lldb/Host/JSONTransport.h
index 1453316e96fb4..892821ba36952 100644
--- a/lldb/include/lldb/Host/JSONTransport.h
+++ b/lldb/include/lldb/Host/JSONTransport.h
@@ -26,6 +26,7 @@
 #include "llvm/Support/FormatVariadic.h"
 #include "llvm/Support/JSON.h"
 #include "llvm/Support/raw_ostream.h"
+#include <atomic>
 #include <functional>
 #include <mutex>
 #include <optional>