diff --git a/lldb/tools/lldb-dap/Handler/CompileUnitsRequestHandler.cpp b/lldb/tools/lldb-dap/Handler/CompileUnitsRequestHandler.cpp
index 230c10470bedb..e1a3b15b4697b 100644
--- a/lldb/tools/lldb-dap/Handler/CompileUnitsRequestHandler.cpp
+++ b/lldb/tools/lldb-dap/Handler/CompileUnitsRequestHandler.cpp
@@ -10,6 +10,7 @@
 #include "EventHelper.h"
 #include "Protocol/ProtocolRequests.h"
 #include "RequestHandler.h"
+#include "lldb/Host/PosixApi.h" // IWYU pragma: keep
 
 using namespace lldb_dap;
 using namespace lldb_dap::protocol;