diff --git a/include/aidge/backend/cpu/operator/ReLUImpl_backward_kernels.hpp b/include/aidge/backend/cpu/operator/ReLUImpl_backward_kernels.hpp
index 4c4aac31b1cbf6f40b9cfee2c32686d3983bc233..02b5e30bc7a8849c53e0b8e1f9b6d8c5d1dd8e2f 100644
--- a/include/aidge/backend/cpu/operator/ReLUImpl_backward_kernels.hpp
+++ b/include/aidge/backend/cpu/operator/ReLUImpl_backward_kernels.hpp
@@ -22,8 +22,8 @@ template <class I, class O, class GI, class GO>
 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 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_);
     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
old mode 100755
new mode 100644
index fa73644fda53c2678a23f09a111383e57c301f76..e10f1d53e09c74304913a10f1ab5bf54080348b2
--- 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
old mode 100755
new mode 100644
index d07bf12b3771528d4015917ce1b7682af70bdab9..6780a4e37bb2d269c17613270aeae685ab7638ea
--- 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_);