diff --git a/jsonchecker/fail76.json b/jsonchecker/fail76.json
new file mode 100644
index 000000000..cca9a783a
--- /dev/null
+++ b/jsonchecker/fail76.json
@@ -0,0 +1 @@
+{"":"\u20A"}
diff --git a/jsonchecker/fail77.json b/jsonchecker/fail77.json
new file mode 100644
index 000000000..8f5f90783
--- /dev/null
+++ b/jsonchecker/fail77.json
@@ -0,0 +1 @@
+{"":"\udbff\u123"}