diff --git a/source/gfoidl.Base64/Internal/Base64UrlEncoder/Base64UrlEncoder.Encode.cs b/source/gfoidl.Base64/Internal/Base64UrlEncoder/Base64UrlEncoder.Encode.cs
index 674afed..0d743cb 100644
--- a/source/gfoidl.Base64/Internal/Base64UrlEncoder/Base64UrlEncoder.Encode.cs
+++ b/source/gfoidl.Base64/Internal/Base64UrlEncoder/Base64UrlEncoder.Encode.cs
@@ -19,8 +19,8 @@ public override int GetEncodedLength(int sourceLength)
             if (sourceLength == 16)
                 return 22;
 
-            int numPaddingChars  = GetNumBase64PaddingCharsAddedByEncode(sourceLength);
             int base64EncodedLen = GetBase64EncodedLength(sourceLength);
+            int numPaddingChars  = GetNumBase64PaddingCharsAddedByEncode(sourceLength);
 
             return base64EncodedLen - numPaddingChars;
         }