diff --git a/xhprof_lib/utils/xhprof_runs.php b/xhprof_lib/utils/xhprof_runs.php
index 2a22a5dc..6dc831e9 100644
--- a/xhprof_lib/utils/xhprof_runs.php
+++ b/xhprof_lib/utils/xhprof_runs.php
@@ -104,6 +104,11 @@ public function __construct($dir = null) {
                      "ini param.");
       }
     }
+
+    if (!is_dir($dir)) {
+        mkdir($dir, 0700, true);
+    }
+
     $this->dir = $dir;
   }