diff --git a/agent/config/builder.go b/agent/config/builder.go
index 9698d0a6e..812b513e3 100644
--- a/agent/config/builder.go
+++ b/agent/config/builder.go
@@ -399,8 +399,8 @@ func (b *Builder) Build() (rt RuntimeConfig, err error) {
 	for _, s := range c.Segments {
 		name := b.stringVal(s.Name)
 		port := b.portVal(fmt.Sprintf("segments[%s].port", name), s.Port)
-		if port == 0 {
-			return RuntimeConfig{}, fmt.Errorf("Port must be specified for segment %q", s.Name)
+		if port <= 0 {
+			return RuntimeConfig{}, fmt.Errorf("Port for segment %q cannot be <= 0", name)
 		}
 
 		bind := b.makeTCPAddr(
diff --git a/agent/config/segments_oss_test.go b/agent/config/segments_oss_test.go
index 35b6db008..432107f27 100644
--- a/agent/config/segments_oss_test.go
+++ b/agent/config/segments_oss_test.go
@@ -27,13 +27,22 @@ func TestSegments(t *testing.T) {
 				return []*net.IPAddr{ipAddr("10.0.0.1")}, nil
 			},
 		},
+		{
+			desc: "segment port must be set",
+			flags: []string{
+				`-data-dir=` + dataDir,
+			},
+			json: []string{`{ "segments":[{ "name":"x" }] }`},
+			hcl:  []string{`segments = [{ name = "x" }]`},
+			err:  `Port for segment "x" cannot be <= 0`,
+		},
 		{
 			desc: "segments not in OSS",
 			flags: []string{
 				`-data-dir=` + dataDir,
 			},
-			json: []string{`{ "segments":[{ "name":"x", "advertise": "unix:///foo" }] }`},
-			hcl:  []string{`segments = [{ name = "x" advertise = "unix:///foo" }]`},
+			json: []string{`{ "segments":[{ "name":"x", "port": 123 }] }`},
+			hcl:  []string{`segments = [{ name = "x" port = 123 }]`},
 			err:  `Network segments are not supported in this version of Consul`,
 			privatev4: func() ([]*net.IPAddr, error) {
 				return []*net.IPAddr{ipAddr("10.0.0.1")}, nil