diff --git a/ui/BankingUiCommon/src/commonMain/kotlin/net/dankito/banking/util/InputValidator.kt b/ui/BankingUiCommon/src/commonMain/kotlin/net/dankito/banking/util/InputValidator.kt
index 591dca55..0ae3f97f 100644
--- a/ui/BankingUiCommon/src/commonMain/kotlin/net/dankito/banking/util/InputValidator.kt
+++ b/ui/BankingUiCommon/src/commonMain/kotlin/net/dankito/banking/util/InputValidator.kt
@@ -58,7 +58,7 @@ open class InputValidator {
         val InvalidBicCharactersPattern = Regex("[^A-Z0-9]")
 
 
-        val InvalidSepaCharactersPattern = Regex("[^${SepaMessageCreator.AllowedSepaCharactersExceptReservedXmlCharactersPattern}]+")
+        val InvalidSepaCharactersPattern = Regex("[[^${SepaMessageCreator.AllowedSepaCharactersExceptReservedXmlCharactersPattern}]|[ÄÖÜäöüß]]+") // diacritics are only needed on Android, seems to use UTF-8 as opposed to iOS // TODO: also add other diacritics
     }