diff --git a/common/src/KokkosKernels_ComparableCast.hpp b/common/src/KokkosKernels_ComparableCast.hpp
index a0ac4d8c06..8d04ba28fe 100644
--- a/common/src/KokkosKernels_ComparableCast.hpp
+++ b/common/src/KokkosKernels_ComparableCast.hpp
@@ -44,7 +44,7 @@ namespace Impl {
    value is not representable.
 */
 template <typename T, typename A>
-constexpr auto comparable_cast(const A &a) {
+KOKKOS_INLINE_FUNCTION constexpr auto comparable_cast(const A &a) {
   // both floating point, use the larger type
   if constexpr (std::is_floating_point_v<T> && std::is_floating_point_v<A>) {
     if constexpr (sizeof(T) >= sizeof(A)) {