diff --git a/src/backends/cl/workloads/ClConvertFp16ToFp32Workload.hpp b/src/backends/cl/workloads/ClConvertFp16ToFp32Workload.hpp
index b644748..f5f230d 100644
--- a/src/backends/cl/workloads/ClConvertFp16ToFp32Workload.hpp
+++ b/src/backends/cl/workloads/ClConvertFp16ToFp32Workload.hpp
@@ -23,8 +23,6 @@
     mutable arm_compute::CLDepthConvertLayer m_Layer;
 };
 
-arm_compute::Status ClConvertFp16ToFp32WorkloadValidate(const TensorInfo& input,
-                                                        const TensorInfo& output,
-                                                        std::string* reasonIfUnsupported);
+arm_compute::Status ClConvertFp16ToFp32WorkloadValidate(const TensorInfo& input, const TensorInfo& output);
 
 } //namespace armnn