diff --git a/Source/VCGeneration/Splits/IsolateAttributeOnJumpsHandler.cs b/Source/VCGeneration/Splits/IsolateAttributeOnJumpsHandler.cs
index 1b38445e6..9a26ea973 100644
--- a/Source/VCGeneration/Splits/IsolateAttributeOnJumpsHandler.cs
+++ b/Source/VCGeneration/Splits/IsolateAttributeOnJumpsHandler.cs
@@ -44,7 +44,8 @@ public static (List<ManualSplit> Isolated, ManualSplit Remainder) GetParts(VCGen
       var blocksToInclude = ancestors.Union(descendants).ToHashSet();
 
       var originalReturn = ((GotoFromReturn)gotoCmd.tok).Origin;
-      if (originalReturn.tok is ImplicitJump) {
+      var returnWasFromOriginalSource = originalReturn.tok is not Token;
+      if (returnWasFromOriginalSource) {
         continue;
       }