diff --git a/cpp/CMakeLists.txt b/cpp/CMakeLists.txt
index d9422edaa8f..dbc55827a32 100644
--- a/cpp/CMakeLists.txt
+++ b/cpp/CMakeLists.txt
@@ -344,10 +344,12 @@ add_library(
   src/join/join.cu
   src/join/join_utils.cu
   src/join/mixed_join.cu
-  src/join/mixed_join_kernels.cu
+  src/join/mixed_join_kernel.cu
+  src/join/mixed_join_kernel_nulls.cu
   src/join/mixed_join_kernels_semi.cu
   src/join/mixed_join_semi.cu
-  src/join/mixed_join_size_kernels.cu
+  src/join/mixed_join_size_kernel.cu
+  src/join/mixed_join_size_kernel_nulls.cu
   src/join/mixed_join_size_kernels_semi.cu
   src/join/semi_join.cu
   src/lists/contains.cu
diff --git a/cpp/src/join/mixed_join_kernel.cu b/cpp/src/join/mixed_join_kernel.cu
new file mode 100644
index 00000000000..f8912f0c7bd
--- /dev/null
+++ b/cpp/src/join/mixed_join_kernel.cu
@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2022, NVIDIA CORPORATION.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "mixed_join_kernel.cuh"
+
+namespace cudf {
+namespace detail {
+
+template __global__ void mixed_join<DEFAULT_JOIN_BLOCK_SIZE, false>(
+  table_device_view left_table,
+  table_device_view right_table,
+  table_device_view probe,
+  table_device_view build,
+  row_equality const equality_probe,
+  join_kind const join_type,
+  cudf::detail::mixed_multimap_type::device_view hash_table_view,
+  size_type* join_output_l,
+  size_type* join_output_r,
+  cudf::ast::detail::expression_device_view device_expression_data,
+  cudf::size_type const* join_result_offsets,
+  bool const swap_tables);
+
+}  // namespace detail
+
+}  // namespace cudf
diff --git a/cpp/src/join/mixed_join_kernels.cu b/cpp/src/join/mixed_join_kernel.cuh
similarity index 82%
rename from cpp/src/join/mixed_join_kernels.cu
rename to cpp/src/join/mixed_join_kernel.cuh
index efaea841e45..f7081cc4d63 100644
--- a/cpp/src/join/mixed_join_kernels.cu
+++ b/cpp/src/join/mixed_join_kernel.cuh
@@ -14,6 +14,8 @@
  * limitations under the License.
  */
 
+#pragma once
+
 #include <join/hash_join.cuh>
 #include <join/join_common_utils.cuh>
 #include <join/join_common_utils.hpp>
@@ -32,6 +34,7 @@
 
 namespace cudf {
 namespace detail {
+
 namespace cg = cooperative_groups;
 
 template <cudf::size_type block_size, bool has_nulls>
@@ -107,34 +110,6 @@ __launch_bounds__(block_size) __global__
   }
 }
 
-template __global__ void mixed_join<DEFAULT_JOIN_BLOCK_SIZE, true>(
-  table_device_view left_table,
-  table_device_view right_table,
-  table_device_view probe,
-  table_device_view build,
-  row_equality const equality_probe,
-  join_kind const join_type,
-  cudf::detail::mixed_multimap_type::device_view hash_table_view,
-  size_type* join_output_l,
-  size_type* join_output_r,
-  cudf::ast::detail::expression_device_view device_expression_data,
-  cudf::size_type const* join_result_offsets,
-  bool const swap_tables);
-
-template __global__ void mixed_join<DEFAULT_JOIN_BLOCK_SIZE, false>(
-  table_device_view left_table,
-  table_device_view right_table,
-  table_device_view probe,
-  table_device_view build,
-  row_equality const equality_probe,
-  join_kind const join_type,
-  cudf::detail::mixed_multimap_type::device_view hash_table_view,
-  size_type* join_output_l,
-  size_type* join_output_r,
-  cudf::ast::detail::expression_device_view device_expression_data,
-  cudf::size_type const* join_result_offsets,
-  bool const swap_tables);
-
 }  // namespace detail
 
 }  // namespace cudf
diff --git a/cpp/src/join/mixed_join_kernel_nulls.cu b/cpp/src/join/mixed_join_kernel_nulls.cu
new file mode 100644
index 00000000000..a911c62b349
--- /dev/null
+++ b/cpp/src/join/mixed_join_kernel_nulls.cu
@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2022, NVIDIA CORPORATION.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "mixed_join_kernel.cuh"
+
+namespace cudf {
+namespace detail {
+
+template __global__ void mixed_join<DEFAULT_JOIN_BLOCK_SIZE, true>(
+  table_device_view left_table,
+  table_device_view right_table,
+  table_device_view probe,
+  table_device_view build,
+  row_equality const equality_probe,
+  join_kind const join_type,
+  cudf::detail::mixed_multimap_type::device_view hash_table_view,
+  size_type* join_output_l,
+  size_type* join_output_r,
+  cudf::ast::detail::expression_device_view device_expression_data,
+  cudf::size_type const* join_result_offsets,
+  bool const swap_tables);
+
+}  // namespace detail
+
+}  // namespace cudf
diff --git a/cpp/src/join/mixed_join_size_kernel.cu b/cpp/src/join/mixed_join_size_kernel.cu
new file mode 100644
index 00000000000..cf8236e2be2
--- /dev/null
+++ b/cpp/src/join/mixed_join_size_kernel.cu
@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2022, NVIDIA CORPORATION.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "mixed_join_size_kernel.cuh"
+
+namespace cudf {
+namespace detail {
+
+template __global__ void compute_mixed_join_output_size<DEFAULT_JOIN_BLOCK_SIZE, false>(
+  table_device_view left_table,
+  table_device_view right_table,
+  table_device_view probe,
+  table_device_view build,
+  row_equality const equality_probe,
+  join_kind const join_type,
+  cudf::detail::mixed_multimap_type::device_view hash_table_view,
+  ast::detail::expression_device_view device_expression_data,
+  bool const swap_tables,
+  std::size_t* output_size,
+  cudf::device_span<cudf::size_type> matches_per_row);
+
+}  // namespace detail
+}  // namespace cudf
diff --git a/cpp/src/join/mixed_join_size_kernels.cu b/cpp/src/join/mixed_join_size_kernel.cuh
similarity index 80%
rename from cpp/src/join/mixed_join_size_kernels.cu
rename to cpp/src/join/mixed_join_size_kernel.cuh
index 22c71bfc33a..9eedc1a8015 100644
--- a/cpp/src/join/mixed_join_size_kernels.cu
+++ b/cpp/src/join/mixed_join_size_kernel.cuh
@@ -99,32 +99,5 @@ __launch_bounds__(block_size) __global__ void compute_mixed_join_output_size(
   if (threadIdx.x == 0) atomicAdd(output_size, block_counter);
 }
 
-template __global__ void compute_mixed_join_output_size<DEFAULT_JOIN_BLOCK_SIZE, true>(
-  table_device_view left_table,
-  table_device_view right_table,
-  table_device_view probe,
-  table_device_view build,
-  row_equality const equality_probe,
-  join_kind const join_type,
-  cudf::detail::mixed_multimap_type::device_view hash_table_view,
-  ast::detail::expression_device_view device_expression_data,
-  bool const swap_tables,
-  std::size_t* output_size,
-  cudf::device_span<cudf::size_type> matches_per_row);
-
-template __global__ void compute_mixed_join_output_size<DEFAULT_JOIN_BLOCK_SIZE, false>(
-  table_device_view left_table,
-  table_device_view right_table,
-  table_device_view probe,
-  table_device_view build,
-  row_equality const equality_probe,
-  join_kind const join_type,
-  cudf::detail::mixed_multimap_type::device_view hash_table_view,
-  ast::detail::expression_device_view device_expression_data,
-  bool const swap_tables,
-  std::size_t* output_size,
-  cudf::device_span<cudf::size_type> matches_per_row);
-
 }  // namespace detail
-
 }  // namespace cudf
diff --git a/cpp/src/join/mixed_join_size_kernel_nulls.cu b/cpp/src/join/mixed_join_size_kernel_nulls.cu
new file mode 100644
index 00000000000..f05d674b3b5
--- /dev/null
+++ b/cpp/src/join/mixed_join_size_kernel_nulls.cu
@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2022, NVIDIA CORPORATION.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "mixed_join_size_kernel.cuh"
+
+namespace cudf {
+namespace detail {
+
+template __global__ void compute_mixed_join_output_size<DEFAULT_JOIN_BLOCK_SIZE, true>(
+  table_device_view left_table,
+  table_device_view right_table,
+  table_device_view probe,
+  table_device_view build,
+  row_equality const equality_probe,
+  join_kind const join_type,
+  cudf::detail::mixed_multimap_type::device_view hash_table_view,
+  ast::detail::expression_device_view device_expression_data,
+  bool const swap_tables,
+  std::size_t* output_size,
+  cudf::device_span<cudf::size_type> matches_per_row);
+
+}  // namespace detail
+}  // namespace cudf