diff --git a/common/src/KokkosFFT_normalization.hpp b/common/src/KokkosFFT_normalization.hpp
index 34ea7b72..363f611d 100644
--- a/common/src/KokkosFFT_normalization.hpp
+++ b/common/src/KokkosFFT_normalization.hpp
@@ -21,7 +21,7 @@ void normalize_impl(const ExecutionSpace& exec_space, ViewType& inout,
       "KokkosFFT::normalize",
       Kokkos::RangePolicy<ExecutionSpace, Kokkos::IndexType<std::size_t>>(
           exec_space, 0, size),
-      KOKKOS_LAMBDA(const int& i) { data[i] *= coef; });
+      KOKKOS_LAMBDA(std::size_t i) { data[i] *= coef; });
 }
 
 template <typename ViewType>
diff --git a/common/src/KokkosFFT_padding.hpp b/common/src/KokkosFFT_padding.hpp
index fe51e1f3..8a9f47e3 100644
--- a/common/src/KokkosFFT_padding.hpp
+++ b/common/src/KokkosFFT_padding.hpp
@@ -103,7 +103,7 @@ void crop_or_pad_impl(const ExecutionSpace& exec_space, const InViewType& in,
       "KokkosFFT::crop_or_pad",
       Kokkos::RangePolicy<ExecutionSpace, Kokkos::IndexType<std::size_t>>(
           exec_space, 0, n0),
-      KOKKOS_LAMBDA(int i0) { out(i0) = in(i0); });
+      KOKKOS_LAMBDA(std::size_t i0) { out(i0) = in(i0); });
 }
 
 template <typename ExecutionSpace, typename InViewType, typename OutViewType>