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diff --git a/libmudflap/testsuite/libmudflap.c/fail13-frag.c b/libmudflap/testsuite/libmudflap.c/fail13-frag.c
new file mode 100644
index 00000000..9fd3e255
--- /dev/null
+++ b/libmudflap/testsuite/libmudflap.c/fail13-frag.c
@@ -0,0 +1,26 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+int main ()
+{
+struct a {
+  int x;
+  int y;
+  char z;
+};
+
+struct b {
+  int x;
+  int y;
+};
+
+struct b k;
+
+(*((volatile struct a *) &k)).z = 'q';
+
+return 0;
+}
+/* { dg-output "mudflap violation 1..check/write.*" } */
+/* { dg-output "Nearby object 1.*" } */
+/* { dg-output "mudflap object.*.main. k.*" } */
+/* { dg-do run { xfail *-*-* } } */