diff --git a/libraries/shared/src/TriangleSet.h b/libraries/shared/src/TriangleSet.h
index 18494d270e..3b39b935af 100644
--- a/libraries/shared/src/TriangleSet.h
+++ b/libraries/shared/src/TriangleSet.h
@@ -45,7 +45,7 @@ class TriangleSet {
         int _depth{ 0 };
         int _population{ 0 };
         AABox _bounds;
-        std::vector<int> _triangleIndices;
+        std::vector<size_t> _triangleIndices;
 
         friend class TriangleSet;
     };