diff --git a/terraform/graph.go b/terraform/graph.go
index efc2c65b4..db492084e 100644
--- a/terraform/graph.go
+++ b/terraform/graph.go
@@ -220,7 +220,7 @@ func (g *Graph) walk(walker GraphWalker) error {
 	// Walk the graph.
 	var walkFn dag.WalkFunc
 	walkFn = func(v dag.Vertex) (rerr error) {
-		log.Printf("[DEBUG] vertex %s.%s: walking", path, dag.VertexName(v))
+		log.Printf("[DEBUG] vertex '%s.%s': walking", path, dag.VertexName(v))
 
 		walker.EnterVertex(v)
 		defer func() { walker.ExitVertex(v, rerr) }()