diff --git a/test/CFrontend/2003-10-02-UnionLValueError.c b/test/CFrontend/2003-10-02-UnionLValueError.c
new file mode 100644
index 00000000000..82693c729bb
--- /dev/null
+++ b/test/CFrontend/2003-10-02-UnionLValueError.c
@@ -0,0 +1,9 @@
+union U{
+  int i[8];
+  char s[80];
+};
+
+void format_message(char *buffer, union U *u) {
+  sprintf(buffer, u->s);
+}
+