diff --git a/projects/clr/rocclr/os/os_win32.cpp b/projects/clr/rocclr/os/os_win32.cpp
index f0db1d803f..90edca5eeb 100644
--- a/projects/clr/rocclr/os/os_win32.cpp
+++ b/projects/clr/rocclr/os/os_win32.cpp
@@ -22,7 +22,7 @@
 
 #include "os/os.hpp"
 #include "thread/thread.hpp"
-
+#include "utils/flags.hpp"
 #include <windows.h>
 #include <process.h>
 #include <tchar.h>