diff --git a/4ABK/in.json b/4ABK/in.json
index 41251055..b7cf9207 100644
--- a/4ABK/in.json
+++ b/4ABK/in.json
@@ -1,6 +1,6 @@
 {
   "": "omitted key",
-  "http://foo.com": "",
-  "omitted value": "",
+  "http://foo.com": null,
+  "omitted value": null,
   "unquoted": "separate"
 }
diff --git a/FRK4/in.json b/FRK4/in.json
index e1b83221..af6d91a1 100644
--- a/FRK4/in.json
+++ b/FRK4/in.json
@@ -1,4 +1,4 @@
 {
-  "foo": "",
+  "foo": null,
   "": "bar"
 }