diff --git a/include/aidge/backend/cpu/operator/ConvDepthWiseImpl_forward_kernels.hpp b/include/aidge/backend/cpu/operator/ConvDepthWiseImpl_forward_kernels.hpp
index 5aa29ac55740d46bba873bb9d85a04cd004cc3bd..f40dfee00ee940e6bc73a2fc337bbee61607d17f 100644
--- a/include/aidge/backend/cpu/operator/ConvDepthWiseImpl_forward_kernels.hpp
+++ b/include/aidge/backend/cpu/operator/ConvDepthWiseImpl_forward_kernels.hpp
@@ -17,6 +17,7 @@
 #include "aidge/backend/cpu/operator/ConvDepthWiseImpl.hpp"
 #include "aidge/utils/Types.h"
 #include <cmath>
+#include <cstddef>
 #include <array>
 #include <algorithm>