diff --git a/gtsam/inference/MetisIndex.cpp b/gtsam/inference/MetisIndex.cpp
deleted file mode 100644
index e69de29bb..000000000
diff --git a/gtsam/inference/Ordering.cpp b/gtsam/inference/Ordering.cpp
index 99b116009..685bbcd0d 100644
--- a/gtsam/inference/Ordering.cpp
+++ b/gtsam/inference/Ordering.cpp
@@ -209,7 +209,7 @@ namespace gtsam {
       vector<int> perm, iperm;
 
 	  idx_t size = xadj.size() - 1;
-	  for (int i = 0; i < size; i++)
+	  for (idx_t i = 0; i < size; i++)
 	  {
 		  perm.push_back(0);
 		  iperm.push_back(0);