diff --git a/caddyconfig/caddyfile/importgraph.go b/caddyconfig/caddyfile/importgraph.go
index d27f4710..d5037fe6 100644
--- a/caddyconfig/caddyfile/importgraph.go
+++ b/caddyconfig/caddyfile/importgraph.go
@@ -21,18 +21,18 @@ import (
 type adjacency map[string][]string
 
 type importGraph struct {
-	nodes map[string]bool
+	nodes map[string]struct{}
 	edges adjacency
 }
 
 func (i *importGraph) addNode(name string) {
 	if i.nodes == nil {
-		i.nodes = make(map[string]bool)
+		i.nodes = make(map[string]struct{})
 	}
 	if _, exists := i.nodes[name]; exists {
 		return
 	}
-	i.nodes[name] = true
+	i.nodes[name] = struct{}{}
 }
 
 func (i *importGraph) addNodes(names []string) {
@@ -66,7 +66,7 @@ func (i *importGraph) addEdge(from, to string) error {
 	}
 
 	if i.nodes == nil {
-		i.nodes = make(map[string]bool)
+		i.nodes = make(map[string]struct{})
 	}
 	if i.edges == nil {
 		i.edges = make(adjacency)
diff --git a/caddyconfig/caddyfile/parse.go b/caddyconfig/caddyfile/parse.go
index 9f79d913..cdb9a761 100644
--- a/caddyconfig/caddyfile/parse.go
+++ b/caddyconfig/caddyfile/parse.go
@@ -50,7 +50,7 @@ func Parse(filename string, input []byte) ([]ServerBlock, error) {
 	p := parser{
 		Dispenser: NewDispenser(tokens),
 		importGraph: importGraph{
-			nodes: make(map[string]bool),
+			nodes: make(map[string]struct{}),
 			edges: make(adjacency),
 		},
 	}