diff --git a/source/nanoFramework.CoreLibrary/System/Convert.cs b/source/nanoFramework.CoreLibrary/System/Convert.cs
index 0ed061d0..5451da28 100644
--- a/source/nanoFramework.CoreLibrary/System/Convert.cs
+++ b/source/nanoFramework.CoreLibrary/System/Convert.cs
@@ -293,7 +293,7 @@ public static byte[] FromBase64CharArray(char[] inArray, int offset, int length)
             var destinationArray = new char[length];
             Array.Copy(inArray, offset, destinationArray, 0, length);
 
-            return FromBase64CharArray(inArray, length);
+            return FromBase64CharArray(destinationArray, length);
         }
 
         [MethodImpl(MethodImplOptions.InternalCall)]