diff --git a/lldb/tools/lldb-dap/ProgressEvent.h b/lldb/tools/lldb-dap/ProgressEvent.h
index dac2197..72317b8 100644
--- a/lldb/tools/lldb-dap/ProgressEvent.h
+++ b/lldb/tools/lldb-dap/ProgressEvent.h
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 #include <atomic>
+#include <chrono>
 #include <mutex>
 #include <optional>
 #include <queue>