diff --git a/boards/sim/sim/sim/src/Makefile b/boards/sim/sim/sim/src/Makefile
index 4d2ca014908..c70af73a83a 100644
--- a/boards/sim/sim/sim/src/Makefile
+++ b/boards/sim/sim/sim/src/Makefile
@@ -74,9 +74,9 @@ else
 endif
 endif
 
-#ifdef CONFIG_NSH_ROMFSETC
+ifeq ($(CONFIG_NSH_ROMFSETC),y)
   RCSRCS = etc/init.d/rcS
   RCRAWS = etc/group etc/passwd
-#endif
+endif
 
 include $(TOPDIR)/boards/Board.mk