diff --git a/sim/rx/Makefile.in b/sim/rx/Makefile.in
index 4e1f2acf214..3c4efa30506 100644
--- a/sim/rx/Makefile.in
+++ b/sim/rx/Makefile.in
@@ -37,5 +37,3 @@ SIM_OBJS = \
 	err.o
 
 ## COMMON_POST_CONFIG_FRAG
-
-arch = rx