diff --git a/test/CFrontend/2007-05-29-UnionCopy.c b/test/CFrontend/2007-05-29-UnionCopy.c
new file mode 100644
index 00000000000..ded67d4d6b2
--- /dev/null
+++ b/test/CFrontend/2007-05-29-UnionCopy.c
@@ -0,0 +1,18 @@
+// RUN: %llvmgcc -S -o - -emit-llvm %s | grep memcpy
+// PR1421
+
+struct A {
+  char c;
+  int i;
+};
+
+struct B {
+  int c;
+  unsigned char x;
+};
+
+union U { struct A a; struct B b; };
+
+void check(union U *u, union U *v) {
+  *u = *v;
+}