diff --git a/delegate/src/DelegateUtils.hpp b/delegate/src/DelegateUtils.hpp
index 5dea567..b04baac 100644
--- a/delegate/src/DelegateUtils.hpp
+++ b/delegate/src/DelegateUtils.hpp
@@ -472,7 +472,8 @@
 
 armnn::ConstTensor CreateConstTensor(const TfLiteTensor* tfLiteTensor,
                                      armnn::TensorInfo& tensorInfo,
-                                     armnn::Optional<armnn::PermutationVector&> permutationVector,
+                                     armnn::Optional<armnn::PermutationVector&>
+                                             permutationVector = armnn::EmptyOptional(),
                                      void* permutationData = nullptr)
 {
     if (tfLiteTensor->allocation_type != kTfLiteMmapRo)