diff --git a/fints4javaLib/src/main/kotlin/net/dankito/fints/response/segments/Feedback.kt b/fints4javaLib/src/main/kotlin/net/dankito/fints/response/segments/Feedback.kt
index 9c3bffb1..6b5f7d66 100644
--- a/fints4javaLib/src/main/kotlin/net/dankito/fints/response/segments/Feedback.kt
+++ b/fints4javaLib/src/main/kotlin/net/dankito/fints/response/segments/Feedback.kt
@@ -40,7 +40,7 @@ open class Feedback(
 
 
     val isSuccess: Boolean
-        get() = responseCode in 1000..1999
+        get() = responseCode in 0..999
 
     val isWarning: Boolean
         get() = responseCode in 3000..3999