diff --git a/src/org/kde/kdeconnect/DeviceHost.kt b/src/org/kde/kdeconnect/DeviceHost.kt
index f1b8664d..82a5dd8f 100644
--- a/src/org/kde/kdeconnect/DeviceHost.kt
+++ b/src/org/kde/kdeconnect/DeviceHost.kt
@@ -43,7 +43,7 @@ class DeviceHost private constructor(private val host: String) {
     companion object {
         /** Ping timeout */
         private const val PING_TIMEOUT = 3_000
-        private val hostnameValidityPattern = Regex("^[0-9A-Za-z._-:]+$")
+        private val hostnameValidityPattern = Regex("^[0-9A-Za-z.:_-]+$")
 
         @JvmStatic
         fun isValidDeviceHost(host: String): Boolean {