diff --git a/src/geoflow/common.cpp b/src/geoflow/common.cpp
index 192bab2..e27f923 100644
--- a/src/geoflow/common.cpp
+++ b/src/geoflow/common.cpp
@@ -352,6 +352,10 @@ bool MultiTriangleCollection::has_attributes()
 {
   return !attributes_.empty();
 }
+bool MultiTriangleCollection::has_attributes() const
+{
+  return !attributes_.empty();
+}
 
 std::vector<TriangleCollection>& MultiTriangleCollection::get_tricollections()
 {
diff --git a/src/geoflow/common.hpp b/src/geoflow/common.hpp
index 4d30c74..f2dd992 100644
--- a/src/geoflow/common.hpp
+++ b/src/geoflow/common.hpp
@@ -163,6 +163,7 @@ class MultiTriangleCollection
   size_t tri_size() const;
   size_t attr_size() const;
   bool has_attributes();
+  bool has_attributes() const;
 };
 
 class SegmentCollection : public GeometryCollection<std::array<arr3f, 2>>