diff --git a/listeners.go b/listeners.go
index 46446420a..e52561dcf 100644
--- a/listeners.go
+++ b/listeners.go
@@ -266,9 +266,18 @@ type ParsedAddress struct {
 	EndPort   uint
 }
 
+// IsUnixNetwork returns true if pa.Network is
+// unix, unixgram, or unixpacket.
+func (pa ParsedAddress) IsUnixNetwork() bool {
+	return isUnixNetwork(pa.Network)
+}
+
 // JoinHostPort is like net.JoinHostPort, but where the port
 // is StartPort + offset.
 func (pa ParsedAddress) JoinHostPort(offset uint) string {
+	if pa.IsUnixNetwork() {
+		return pa.Host
+	}
 	return net.JoinHostPort(pa.Host, strconv.Itoa(int(pa.StartPort+offset)))
 }
 
@@ -290,6 +299,10 @@ func (pa ParsedAddress) String() string {
 	return JoinNetworkAddress(pa.Network, pa.Host, port)
 }
 
+func isUnixNetwork(netw string) bool {
+	return netw == "unix" || netw == "unixgram" || netw == "unixpacket"
+}
+
 // ParseNetworkAddress parses addr into its individual
 // components. The input string is expected to be of
 // the form "network/host:port-range" where any part is
@@ -307,7 +320,7 @@ func ParseNetworkAddress(addr string) (ParsedAddress, error) {
 	if err != nil {
 		return ParsedAddress{}, err
 	}
-	if network == "unix" || network == "unixgram" || network == "unixpacket" {
+	if isUnixNetwork(network) {
 		return ParsedAddress{
 			Network: network,
 			Host:    host,
diff --git a/listeners_test.go b/listeners_test.go
index 076b36558..25e1394a6 100644
--- a/listeners_test.go
+++ b/listeners_test.go
@@ -250,3 +250,52 @@ func TestParseNetworkAddress(t *testing.T) {
 		}
 	}
 }
+
+func TestJoinHostPort(t *testing.T) {
+	for i, tc := range []struct {
+		pa     ParsedAddress
+		offset uint
+		expect string
+	}{
+		{
+			pa: ParsedAddress{
+				Network:   "tcp",
+				Host:      "localhost",
+				StartPort: 1234,
+				EndPort:   1234,
+			},
+			expect: "localhost:1234",
+		},
+		{
+			pa: ParsedAddress{
+				Network:   "tcp",
+				Host:      "localhost",
+				StartPort: 1234,
+				EndPort:   1235,
+			},
+			expect: "localhost:1234",
+		},
+		{
+			pa: ParsedAddress{
+				Network:   "tcp",
+				Host:      "localhost",
+				StartPort: 1234,
+				EndPort:   1235,
+			},
+			offset: 1,
+			expect: "localhost:1235",
+		},
+		{
+			pa: ParsedAddress{
+				Network: "unix",
+				Host:    "/run/php/php7.3-fpm.sock",
+			},
+			expect: "/run/php/php7.3-fpm.sock",
+		},
+	} {
+		actual := tc.pa.JoinHostPort(tc.offset)
+		if actual != tc.expect {
+			t.Errorf("Test %d: Expected '%s' but got '%s'", i, tc.expect, actual)
+		}
+	}
+}