diff --git a/ext/json/parser/prereq.mk b/ext/json/parser/prereq.mk
index f5d22d058e..440ef4017e 100644
--- a/ext/json/parser/prereq.mk
+++ b/ext/json/parser/prereq.mk
@@ -4,5 +4,6 @@ RAGEL = ragel
 
 .rl.c:
 	$(RAGEL) -G2 $<
+	$(BASERUBY) -pli -e '$$_.sub!(/[ \t]+$$/, "")' $@
 
 parser.c: