diff --git a/plugins/input/topojson/topojson_datasource.cpp b/plugins/input/topojson/topojson_datasource.cpp
index 225a767a1..e86337ae4 100644
--- a/plugins/input/topojson/topojson_datasource.cpp
+++ b/plugins/input/topojson/topojson_datasource.cpp
@@ -220,8 +220,8 @@ void topojson_datasource::parse_topojson(T const& buffer)
                 extent_.expand_to_include(box);
             }
             values.emplace_back(box, geometry_index);
-            ++geometry_index;
         }
+        ++geometry_index;
     }
 
     // packing algorithm