diff --git a/include/aidge/backend/cpu/operator/ReLUImpl_backward_kernels.hpp b/include/aidge/backend/cpu/operator/ReLUImpl_backward_kernels.hpp
index 02b5e30bc7a8849c53e0b8e1f9b6d8c5d1dd8e2f..e67a4588fcdd238bd149468ae735492dde133419 100644
--- a/include/aidge/backend/cpu/operator/ReLUImpl_backward_kernels.hpp
+++ b/include/aidge/backend/cpu/operator/ReLUImpl_backward_kernels.hpp
@@ -23,7 +23,7 @@ void ReLUImpl_cpu_backward_kernel(const std::size_t inputLenght,
                                   const void* input_, const void* output_, const void* grad_output_,
 								  void* grad_input_) {
     const I* input = static_cast<const I*>(input_);
-    #const O* output = static_cast<const O*>(output_);
+    //const O* output = static_cast<const O*>(output_);
     const GO* grad_output = static_cast<const GO*>(grad_output_);
     GI* grad_input = static_cast<GI*>(grad_input_);
     for (std::size_t i = 0; i < inputLenght; ++i) {
diff --git a/include/aidge/backend/cpu/operator/SigmoidImpl_backward_kernels.hpp b/include/aidge/backend/cpu/operator/SigmoidImpl_backward_kernels.hpp
index e10f1d53e09c74304913a10f1ab5bf54080348b2..931a2e4df129de2d85bad54cae009158fcffce9e 100644
--- a/include/aidge/backend/cpu/operator/SigmoidImpl_backward_kernels.hpp
+++ b/include/aidge/backend/cpu/operator/SigmoidImpl_backward_kernels.hpp
@@ -22,7 +22,7 @@ template <class I, class O, class GI, class GO>
 void SigmoidImpl_cpu_backward_kernel(const std::size_t inputLenght,
                                      const void* input_, const void* output_, const void* grad_output_,
 								     void* grad_input_) {
-    #const I* input = static_cast<const I*>(input_);
+    //const I* input = static_cast<const I*>(input_);
     const O* output = static_cast<const O*>(output_);
     const GO* grad_output = static_cast<const GO*>(grad_output_);
     GI* grad_input = static_cast<GI*>(grad_input_);
diff --git a/include/aidge/backend/cpu/operator/TanhImpl_backward_kernels.hpp b/include/aidge/backend/cpu/operator/TanhImpl_backward_kernels.hpp
index 6780a4e37bb2d269c17613270aeae685ab7638ea..3f49e4c4559506a7eff06a0a54eb4eacd6178643 100644
--- a/include/aidge/backend/cpu/operator/TanhImpl_backward_kernels.hpp
+++ b/include/aidge/backend/cpu/operator/TanhImpl_backward_kernels.hpp
@@ -22,7 +22,7 @@ template <class I, class O, class GI, class GO>
 void TanhImpl_cpu_backward_kernel(const std::size_t inputLenght,
                                   const void* input_, const void* output_, const void* grad_output_,
 			  			          void* grad_input_) {
-    #const I* input = static_cast<const I*>(input_);
+    //const I* input = static_cast<const I*>(input_);
     const O* output = static_cast<const O*>(output_);
     const GO* grad_output = static_cast<const GO*>(grad_output_);
     GI* grad_input = static_cast<GI*>(grad_input_);