diff --git a/cudax/include/cuda/experimental/__cuco/capacity.cuh b/cudax/include/cuda/experimental/__cuco/capacity.cuh
index db1d1611060..e815384c75d 100644
--- a/cudax/include/cuda/experimental/__cuco/capacity.cuh
+++ b/cudax/include/cuda/experimental/__cuco/capacity.cuh
@@ -30,7 +30,7 @@
 #include <cuda/std/__limits/numeric_limits.h>
 #include <cuda/std/cstdint>
 
-#include <cuda/experimental/__cuco/detail/prime.hpp>
+#include <cuda/experimental/__cuco/detail/prime.cuh>
 #include <cuda/experimental/__cuco/probing_scheme.cuh>
 
 #include <cuda/std/__cccl/prologue.h>
diff --git a/cudax/include/cuda/experimental/__cuco/detail/open_addressing/open_addressing_ref_impl.cuh b/cudax/include/cuda/experimental/__cuco/detail/open_addressing/open_addressing_ref_impl.cuh
index 9e7032cc1f4..1001496207b 100644
--- a/cudax/include/cuda/experimental/__cuco/detail/open_addressing/open_addressing_ref_impl.cuh
+++ b/cudax/include/cuda/experimental/__cuco/detail/open_addressing/open_addressing_ref_impl.cuh
@@ -37,7 +37,7 @@
 #include <cuda/experimental/__cuco/detail/bitwise_compare.cuh>
 #include <cuda/experimental/__cuco/detail/equal_wrapper.cuh>
 #include <cuda/experimental/__cuco/detail/utility/cuda.cuh>
-#include <cuda/experimental/__cuco/detail/utility/traits.hpp>
+#include <cuda/experimental/__cuco/detail/utility/traits.cuh>
 #include <cuda/experimental/__cuco/probing_scheme.cuh>
 
 #include <cooperative_groups.h>
diff --git a/cudax/include/cuda/experimental/__cuco/detail/prime.hpp b/cudax/include/cuda/experimental/__cuco/detail/prime.cuh
similarity index 97%
rename from cudax/include/cuda/experimental/__cuco/detail/prime.hpp
rename to cudax/include/cuda/experimental/__cuco/detail/prime.cuh
index 215b70dcfde..f5a85a5996a 100644
--- a/cudax/include/cuda/experimental/__cuco/detail/prime.hpp
+++ b/cudax/include/cuda/experimental/__cuco/detail/prime.cuh
@@ -8,8 +8,8 @@
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef _CUDAX___CUCO_DETAIL_PRIME_HPP
-#define _CUDAX___CUCO_DETAIL_PRIME_HPP
+#ifndef _CUDAX___CUCO_DETAIL_PRIME_CUH
+#define _CUDAX___CUCO_DETAIL_PRIME_CUH
 
 #include <cuda/std/detail/__config>
 
@@ -170,4 +170,4 @@ __mod_pow(::cuda::std::uint64_t __b, ::cuda::std::uint64_t __e, ::cuda::std::uin
 
 #include <cuda/std/__cccl/epilogue.h>
 
-#endif // _CUDAX___CUCO_DETAIL_PRIME_HPP
+#endif // _CUDAX___CUCO_DETAIL_PRIME_CUH
diff --git a/cudax/include/cuda/experimental/__cuco/detail/utility/traits.hpp b/cudax/include/cuda/experimental/__cuco/detail/utility/traits.cuh
similarity index 91%
rename from cudax/include/cuda/experimental/__cuco/detail/utility/traits.hpp
rename to cudax/include/cuda/experimental/__cuco/detail/utility/traits.cuh
index 7ae49414a10..bf7826965cd 100644
--- a/cudax/include/cuda/experimental/__cuco/detail/utility/traits.hpp
+++ b/cudax/include/cuda/experimental/__cuco/detail/utility/traits.cuh
@@ -8,8 +8,8 @@
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef _CUDAX___CUCO_DETAIL_UTILITY_TRAITS_HPP
-#define _CUDAX___CUCO_DETAIL_UTILITY_TRAITS_HPP
+#ifndef _CUDAX___CUCO_DETAIL_UTILITY_TRAITS_CUH
+#define _CUDAX___CUCO_DETAIL_UTILITY_TRAITS_CUH
 
 #include <cuda/std/detail/__config>
 
@@ -42,4 +42,4 @@ inline constexpr bool __is_pair_like_v = ::cuda::std::__pair_like<
 
 #include <cuda/std/__cccl/epilogue.h>
 
-#endif // _CUDAX___CUCO_DETAIL_UTILITY_TRAITS_HPP
+#endif // _CUDAX___CUCO_DETAIL_UTILITY_TRAITS_CUH