diff --git a/cpp/CMakeLists.txt b/cpp/CMakeLists.txt
index f23d9db9b8..a8d9149ca2 100644
--- a/cpp/CMakeLists.txt
+++ b/cpp/CMakeLists.txt
@@ -282,10 +282,10 @@ set(CUGRAPH_SOURCES
     src/sampling/detail/sample_edges_mg_v32_e32.cu
     src/sampling/detail/shuffle_and_organize_output_mg_v64_e64.cu
     src/sampling/detail/shuffle_and_organize_output_mg_v32_e32.cu
-    src/sampling/neighbor_sampling_mg_v32_e32.cpp
-    src/sampling/neighbor_sampling_mg_v64_e64.cpp
-    src/sampling/neighbor_sampling_sg_v32_e32.cpp
-    src/sampling/neighbor_sampling_sg_v64_e64.cpp
+    src/sampling/neighbor_sampling_mg_v32_e32.cu
+    src/sampling/neighbor_sampling_mg_v64_e64.cu
+    src/sampling/neighbor_sampling_sg_v32_e32.cu
+    src/sampling/neighbor_sampling_sg_v64_e64.cu
     src/sampling/negative_sampling_sg_v32_e32.cu
     src/sampling/negative_sampling_sg_v64_e64.cu
     src/sampling/negative_sampling_mg_v32_e32.cu