diff --git a/Makefile b/Makefile
index 5499563..f0cfa71 100644
--- a/Makefile
+++ b/Makefile
@@ -16,7 +16,7 @@ essai.o:	essai.c  Makefile
 	$(CC) ${CCOPT} $< -c 
 
 
-essai:	essai.o  Makefile $(CLIB)
+essai:	essai.o  Makefile $(CLIB) ${OSERIAL}
 	$(CC) ${CCOPT} $< $(CLIB) ${OSERIAL} -lncurses -o $@
 
 fake-values:	fake-values.c  Makefile $(CLIB)