1 files changed, 2 insertions, 2 deletions
diff --git a/Makefile b/Makefile
index 98a669ed3..39168d765 100644
--- a/Makefile
+++ b/Makefile
@@ -482,10 +482,10 @@ ifneq ($(wildcard .tags-depend),)
 endif
 
 ast_expr2.c:
-	bison -d --name-prefix=ast_yy ast_expr2.y -o ast_expr2.c
+	bison -o $@ -d --name-prefix=ast_yy ast_expr2.y
 
 ast_expr2f.c:
-	flex --full ast_expr2.fl
+	flex -o $@ --full ast_expr2.fl
 
 testexpr2: ast_expr2f.c ast_expr2.c ast_expr2.h
 	gcc -g -c -DSTANDALONE ast_expr2f.c