diff --git a/lib/libc_r/uthread/Makefile.inc b/lib/libc_r/uthread/Makefile.inc
index c01f5ceebcc..6c70e324f59 100644
--- a/lib/libc_r/uthread/Makefile.inc
+++ b/lib/libc_r/uthread/Makefile.inc
@@ -20,6 +20,7 @@ SRCS+= \
 	uthread_attr_getscope.c \
 	uthread_attr_getstackaddr.c \
 	uthread_attr_getstacksize.c \
+	uthread_attr_get_np.c \
 	uthread_attr_setcreatesuspend_np.c \
 	uthread_attr_setdetachstate.c \
 	uthread_attr_setguardsize.c \