diff --git a/matrix-sdk-android/src/main/java/im/vector/matrix/android/api/auth/data/HomeServerConnectionConfig.kt b/matrix-sdk-android/src/main/java/im/vector/matrix/android/api/auth/data/HomeServerConnectionConfig.kt
index 36b812ce16..125a7dfc1b 100644
--- a/matrix-sdk-android/src/main/java/im/vector/matrix/android/api/auth/data/HomeServerConnectionConfig.kt
+++ b/matrix-sdk-android/src/main/java/im/vector/matrix/android/api/auth/data/HomeServerConnectionConfig.kt
@@ -69,7 +69,7 @@ data class HomeServerConnectionConfig(
          */
         fun withHomeServerUri(hsUri: Uri): Builder {
             if (hsUri.scheme != "http" && hsUri.scheme != "https") {
-                throw RuntimeException("Invalid home server URI: " + hsUri)
+                throw RuntimeException("Invalid home server URI: $hsUri")
             }
             // ensure trailing /
             val hsString = hsUri.toString().ensureTrailingSlash()