diff --git a/unit_tests/optimizer/Test_Adam.cpp b/unit_tests/optimizer/Test_Adam.cpp
index ef5482d448f49e3c44f7fa97fb8ae67f40e9cb44..e3957a7fe5b571115fc067240b72029dea1c6bae 100644
--- a/unit_tests/optimizer/Test_Adam.cpp
+++ b/unit_tests/optimizer/Test_Adam.cpp
@@ -23,6 +23,7 @@
 #include "aidge/learning/learningRate/LRSchedulerList.hpp"
 #include "aidge/learning/optimizer/Optimizer.hpp"
 #include "aidge/learning/optimizer/Adam.hpp"
+#include "aidge/backend/cpu/operator/SqrtImpl.hpp"
 #include "aidge/utils/TensorUtils.hpp"
 
 namespace Aidge {