diff --git a/src/xrt/auxiliary/os/os_threading.h b/src/xrt/auxiliary/os/os_threading.h
index 7129cec70..127e04ab0 100644
--- a/src/xrt/auxiliary/os/os_threading.h
+++ b/src/xrt/auxiliary/os/os_threading.h
@@ -9,6 +9,7 @@
  */
 
 #include "xrt/xrt_compiler.h"
+#include "xrt/xrt_config.h"
 #include "util/u_misc.h"
 
 #ifdef XRT_OS_LINUX