diff --git a/src/main/kotlin/com/jetpackduba/gitnuro/credentials/CredentialsCacheRepository.kt b/src/main/kotlin/com/jetpackduba/gitnuro/credentials/CredentialsCacheRepository.kt
index 0e5dfb1..f0fa3b2 100644
--- a/src/main/kotlin/com/jetpackduba/gitnuro/credentials/CredentialsCacheRepository.kt
+++ b/src/main/kotlin/com/jetpackduba/gitnuro/credentials/CredentialsCacheRepository.kt
@@ -84,7 +84,7 @@ class CredentialsCacheRepository @Inject constructor() {
     }
 
     private fun getRandomKey(): String {
-        val allowedChars = ('A'..'Z') + ('a'..'z') + ('0'..'9') + '#!$%=?-_.,@µ*:;+~'
+        val allowedChars = ('A'..'Z') + ('a'..'z') + ('0'..'9') + "#!$%=?-_.,@µ*:;+~".toList()
         return (1..KEY_LENGTH)
             .map { allowedChars.random() }
             .joinToString("")