diff --git a/src/models/frozen_graph.rs b/src/models/frozen_graph.rs
index f87d737..220d6c1 100644
--- a/src/models/frozen_graph.rs
+++ b/src/models/frozen_graph.rs
@@ -142,8 +142,9 @@ impl GraphTopology for FrozenGraph {
         self.incidences.len() / 2
     }
 
+    // TODO: Find a way to reduce the needed capacity for the edge ElementMap. This could be improved by finding a small vertex cover and store those vertices first. See https://en.wikipedia.org/wiki/Vertex_cover#Approximate_evaluation
     fn edge_map<T: Clone>(&self, default: T) -> ElementMap<Self::Edge, T> {
-        ElementMap::new(default, |e| e.0, self.edge_count())
+        ElementMap::new(default, |e| e.0, self.incidences.len() - 1)
     }
 
     fn degree(&self, v: Self::Vertex) -> usize {