diff --git a/platform/util-ex/src/com/intellij/credentialStore/OneTimeString.kt b/platform/util-ex/src/com/intellij/credentialStore/OneTimeString.kt
index 4eb02bd67e3d..872af1487988 100644
--- a/platform/util-ex/src/com/intellij/credentialStore/OneTimeString.kt
+++ b/platform/util-ex/src/com/intellij/credentialStore/OneTimeString.kt
@@ -90,7 +90,7 @@ class OneTimeString @JvmOverloads constructor(value: CharArray, offset: Int = 0,
 
   fun appendTo(builder: StringBuilder) {
     consume(false)
-    builder.append(myChars, myStart, length)
+    builder.appendRange(myChars, myStart, myStart + length)
   }
 }