diff --git a/Makefile b/Makefile
index dd1746f916..2488265c01 100644
--- a/Makefile
+++ b/Makefile
@@ -51,9 +51,9 @@ test: conf ac1 ac2
 	PAPARAZZI_HOME=$(PAPARAZZI_SRC) PAPARAZZI_SRC=$(PAPARAZZI_SRC) $(SUPERVISION)
 
 ac1 : 
-	make AIRCRAFT=Twin1 PAPARAZZI_HOME=$(PAPARAZZI_SRC) ac
+	make AIRCRAFT=Twin1 PAPARAZZI_HOME=$(PAPARAZZI_SRC) sim_ac
 ac2 :
-	make AIRCRAFT=Twin2 PAPARAZZI_HOME=$(PAPARAZZI_SRC) ac
+	make AIRCRAFT=Twin2 PAPARAZZI_HOME=$(PAPARAZZI_SRC) sim_ac
 
 lib:
 	cd $(LIB)/ocaml; $(MAKE)