diff --git a/CHANGELOG.md b/CHANGELOG.md
index e4899a4d..4340c49e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,8 +1,12 @@
+## 0.8.1 / 2022-10-21
+
+* [BUGFIX] Fix systemd activation flag when using a custom kingpin app. #118
+
 ## 0.8.0 / 2022-10-10
 
-* [CHANGE] Change some structs suffix from `Struct` to `Config` #114
-* [FEATURE] Add multiple listeners and systemd socket support #95
-* [FEATURE] Allow TLS parameters to be set in code #110
+* [CHANGE] Change some structs suffix from `Struct` to `Config`. #114
+* [FEATURE] Add multiple listeners and systemd socket support. #95
+* [FEATURE] Allow TLS parameters to be set in code. #110
 
 ## 0.7.1 / 2021-12-02
 
diff --git a/VERSION b/VERSION
index a3df0a69..6f4eebdf 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-0.8.0
+0.8.1
diff --git a/web/kingpinflag/flag.go b/web/kingpinflag/flag.go
index f4caa98e..b0223eb3 100644
--- a/web/kingpinflag/flag.go
+++ b/web/kingpinflag/flag.go
@@ -26,7 +26,7 @@ import (
 func AddFlags(a *kingpin.Application, defaultAddress string) *web.FlagConfig {
 	systemdSocket := func() *bool { b := false; return &b }() // Socket activation only available on Linux
 	if runtime.GOOS == "linux" {
-		systemdSocket = kingpin.Flag(
+		systemdSocket = a.Flag(
 			"web.systemd-socket",
 			"Use systemd socket activation listeners instead of port listeners (Linux only).",
 		).Bool()