diff --git a/lldb/tools/lldb-dap/ProgressEvent.h b/lldb/tools/lldb-dap/ProgressEvent.h
index dac21977add2d..72317b879c803 100644
--- a/lldb/tools/lldb-dap/ProgressEvent.h
+++ b/lldb/tools/lldb-dap/ProgressEvent.h
@@ -7,6 +7,7 @@
//===----------------------------------------------------------------------===//
#include
+#include
#include
#include
#include