diff --git a/src/test/run-pass/invoke-external-native.rs b/src/test/run-pass/invoke-external-native.rs
new file mode 100644
index 00000000000..6234685419b
--- /dev/null
+++ b/src/test/run-pass/invoke-external-native.rs
@@ -0,0 +1,11 @@
+// xfail-test
+
+import std::sys;
+
+// The purpose of this test is to check that we can
+// successfully (and safely) invoke external, c-stack-cdecl
+// functions from outside the crate.
+
+fn main() {
+    let foo = sys::rustrt::last_os_error();
+}
\ No newline at end of file
diff --git a/src/test/stdtest/sys.rs b/src/test/stdtest/sys.rs
index 547adba7bf5..6f766e9ee6b 100644
--- a/src/test/stdtest/sys.rs
+++ b/src/test/stdtest/sys.rs
@@ -1,4 +1,6 @@
 import std::sys;
 
 #[test]
-fn last_os_error() unsafe { log sys::rustrt::last_os_error(); }
+fn last_os_error() {
+    log sys::last_os_error();
+}