diff --git a/test/CFrontend/2006-01-13-StackSave.c b/test/CFrontend/2006-01-13-StackSave.c
new file mode 100644
index 00000000000..a14123c4fa8
--- /dev/null
+++ b/test/CFrontend/2006-01-13-StackSave.c
@@ -0,0 +1,12 @@
+// RUN: %llvmgcc %s -S -o - | gccas | llvm-dis | grep llvm.stacksave
+// XFAIL: *
+
+// PR691
+
+void test(int N) {
+  int i;
+  for (i = 0; i < N; ++i) {
+    int VLA[i];
+    external(VLA);
+  }
+}