diff --git a/src/uapi.go b/src/uapi.go
index 034033a..326216b 100644
--- a/src/uapi.go
+++ b/src/uapi.go
@@ -151,7 +151,7 @@ func ipcSetOperation(device *Device, socket *bufio.ReadWriter) *IPCError {
 				err = updateUDPConn(device)
 				if err != nil {
 					logError.Println("Failed to set listen_port:", err)
-					return &IPCError{Code: ipcErrorIO}
+					return &IPCError{Code: ipcErrorPortInUse}
 				}
 
 				// TODO: Clear source address of all peers
diff --git a/src/uapi_darwin.go b/src/uapi_darwin.go
index 13e5c4f..63d4d8d 100644
--- a/src/uapi_darwin.go
+++ b/src/uapi_darwin.go
@@ -11,9 +11,9 @@ import (
 
 const (
 	ipcErrorIO         = -int64(unix.EIO)
-	ipcErrorNotDefined = -int64(unix.ENODEV)
 	ipcErrorProtocol   = -int64(unix.EPROTO)
 	ipcErrorInvalid    = -int64(unix.EINVAL)
+	ipcErrorPortInUse  = -int64(unix.EADDRINUSE)
 	socketDirectory    = "/var/run/wireguard"
 	socketName         = "%s.sock"
 )
diff --git a/src/uapi_linux.go b/src/uapi_linux.go
index db4f040..cb9d858 100644
--- a/src/uapi_linux.go
+++ b/src/uapi_linux.go
@@ -11,9 +11,9 @@ import (
 
 const (
 	ipcErrorIO         = -int64(unix.EIO)
-	ipcErrorNotDefined = -int64(unix.ENODEV)
 	ipcErrorProtocol   = -int64(unix.EPROTO)
 	ipcErrorInvalid    = -int64(unix.EINVAL)
+	ipcErrorPortInUse  = -int64(unix.EADDRINUSE)
 	socketDirectory    = "/var/run/wireguard"
 	socketName         = "%s.sock"
 )
diff --git a/src/uapi_windows.go b/src/uapi_windows.go
index d56e965..a4599a5 100644
--- a/src/uapi_windows.go
+++ b/src/uapi_windows.go
@@ -12,9 +12,9 @@ import (
 
 const (
 	ipcErrorIO         = -int64(windows.ERROR_BROKEN_PIPE)
-	ipcErrorNotDefined = -int64(windows.ERROR_SERVICE_SPECIFIC_ERROR)
-	ipcErrorProtocol   = -int64(windows.ERROR_SERVICE_SPECIFIC_ERROR)
-	ipcErrorInvalid    = -int64(windows.ERROR_SERVICE_SPECIFIC_ERROR)
+	ipcErrorProtocol   = -int64(windows.ERROR_INVALID_NAME)
+	ipcErrorInvalid    = -int64(windows.ERROR_INVALID_PARAMETER)
+	ipcErrorPortInUse  = -int64(windows.ERROR_ALREADY_EXISTS)
 )
 
 const PipeNameFmt = "\\\\.\\pipe\\wireguard-ipc-%s"