diff --git a/src/libcore/os.rs b/src/libcore/os.rs
index 6993eb82d012..2fb02a96e197 100644
--- a/src/libcore/os.rs
+++ b/src/libcore/os.rs
@@ -968,6 +968,11 @@ mod tests {
                                |s| setenv(~"USERPROFILE", s));
     }
 
+    #[test]
+    fn tmpdir() {
+        option::iter(os::tmpdir(), |s| assert !str::is_empty(s));
+    }
+
     // Issue #712
     #[test]
     fn test_list_dir_no_invalid_memory_access() { os::list_dir(~"."); }