diff --git a/acl/acl.go b/acl/acl.go
index 8a73674d02..cfe1ff6b66 100644
--- a/acl/acl.go
+++ b/acl/acl.go
@@ -135,7 +135,7 @@ type PolicyACL struct {
 	keyRules *radix.Tree
 
 	// serviceRules contains the service policies
-	serviceRules map[string]string
+	serviceRules *radix.Tree
 }
 
 // New is used to construct a policy based ACL from a set of policies
@@ -144,7 +144,7 @@ func New(parent ACL, policy *Policy) (*PolicyACL, error) {
 	p := &PolicyACL{
 		parent:       parent,
 		keyRules:     radix.New(),
-		serviceRules: make(map[string]string, len(policy.Services)),
+		serviceRules: radix.New(),
 	}
 
 	// Load the key policy
@@ -154,7 +154,7 @@ func New(parent ACL, policy *Policy) (*PolicyACL, error) {
 
 	// Load the service policy
 	for _, sp := range policy.Services {
-		p.serviceRules[sp.Name] = sp.Policy
+		p.serviceRules.Insert(sp.Name, sp.Policy)
 	}
 	return p, nil
 }
@@ -231,10 +231,8 @@ func (p *PolicyACL) KeyWritePrefix(prefix string) bool {
 // ServiceRead checks if reading (discovery) of a service is allowed
 func (p *PolicyACL) ServiceRead(name string) bool {
 	// Check for an exact rule or catch-all
-	rule, ok := p.serviceRules[name]
-	if !ok {
-		rule, ok = p.serviceRules[""]
-	}
+	_, rule, ok := p.serviceRules.LongestPrefix(name)
+
 	if ok {
 		switch rule {
 		case ServicePolicyWrite:
@@ -253,10 +251,8 @@ func (p *PolicyACL) ServiceRead(name string) bool {
 // ServiceWrite checks if writing (registering) a service is allowed
 func (p *PolicyACL) ServiceWrite(name string) bool {
 	// Check for an exact rule or catch-all
-	rule, ok := p.serviceRules[name]
-	if !ok {
-		rule, ok = p.serviceRules[""]
-	}
+	_, rule, ok := p.serviceRules.LongestPrefix(name)
+
 	if ok {
 		switch rule {
 		case ServicePolicyWrite:
diff --git a/acl/acl_test.go b/acl/acl_test.go
index cecc870b97..d6da2f93e8 100644
--- a/acl/acl_test.go
+++ b/acl/acl_test.go
@@ -127,6 +127,10 @@ func TestPolicyACL(t *testing.T) {
 				Name:   "bar",
 				Policy: ServicePolicyDeny,
 			},
+			&ServicePolicy{
+				Name:   "barfoo",
+				Policy: ServicePolicyWrite,
+			},
 		},
 	}
 	acl, err := New(all, policy)
@@ -171,6 +175,10 @@ func TestPolicyACL(t *testing.T) {
 		{"other", true, true},
 		{"foo", true, false},
 		{"bar", false, false},
+		{"foobar", true, false},
+		{"barfo", false, false},
+		{"barfoo", true, true},
+		{"barfoo2", true, true},
 	}
 	for _, c := range scases {
 		if c.read != acl.ServiceRead(c.inp) {