diff --git a/src/modules/Elsa.IO/Extensions/ContentTypeExtensions.cs b/src/modules/Elsa.IO/Extensions/ContentTypeExtensions.cs
index 9eac5a42a..45bf158ef 100644
--- a/src/modules/Elsa.IO/Extensions/ContentTypeExtensions.cs
+++ b/src/modules/Elsa.IO/Extensions/ContentTypeExtensions.cs
@@ -102,7 +102,7 @@ public static class ContentTypeExtensions
         switch (paddingIndex)
         {
             // Padding cannot be at index 0
-            case <= 0:
+            case 0:
             // Padding must be at the end
             case > 0 when paddingIndex < s.Length - 2:
             // All characters after first '=' must also be '='