diff --git a/tests/setjmp_test.cpp b/tests/setjmp_test.cpp
index a3b5885..944dac8 100644
--- a/tests/setjmp_test.cpp
+++ b/tests/setjmp_test.cpp
@@ -212,3 +212,30 @@
     CHECK_FREGS;
   }
 }
+
+#if defined(__arm__)
+#define __JB_SIGFLAG 0
+#elif defined(__aarch64__)
+#define __JB_SIGFLAG 0
+#elif defined(__i386__)
+#define __JB_SIGFLAG 7
+#elif defined(__x86_64)
+#define __JB_SIGFLAG 8
+#endif
+
+TEST(setjmp, setjmp_cookie) {
+#if !defined(__mips__)
+  jmp_buf jb;
+  int value = setjmp(jb);
+  ASSERT_EQ(0, value);
+
+  long* sigflag = reinterpret_cast<long*>(jb) + __JB_SIGFLAG;
+
+  // Make sure there's actually a cookie.
+  EXPECT_NE(0, *sigflag & ~1);
+
+  // Wipe it out
+  *sigflag &= 1;
+  EXPECT_DEATH(longjmp(jb, 0), "");
+#endif
+}