diff --git a/test/CodeGen/union.c b/test/CodeGen/union.c
index 1883ca6..5c89e2d 100644
--- a/test/CodeGen/union.c
+++ b/test/CodeGen/union.c
@@ -42,3 +42,5 @@
 // PR6164
 typedef union T0 { unsigned int : 0; } T0;
 T0 t0;
+
+union { int large_bitfield: 31; char c } u2;