diff --git a/cpp/CMakeLists.txt b/cpp/CMakeLists.txt
index bfa9cba085..f02450ac0a 100644
--- a/cpp/CMakeLists.txt
+++ b/cpp/CMakeLists.txt
@@ -420,6 +420,25 @@ if(BUILD_CUML_CPP_LIBRARY)
         src/hdbscan/hdbscan.cu
         src/hdbscan/condensed_hierarchy.cu
         src/hdbscan/prediction_data.cu)
+
+    set_property(
+      SOURCE src/hdbscan/condensed_hierarchy.cu
+      APPEND_STRING
+      PROPERTY COMPILE_FLAGS
+      " -Xcompiler=-Wno-maybe-uninitialized"
+    )
+    set_property(
+      SOURCE src/hdbscan/hdbscan.cu
+      APPEND_STRING
+      PROPERTY COMPILE_FLAGS
+      " -Xcompiler=-Wno-maybe-uninitialized"
+    )
+    set_property(
+      SOURCE src/hdbscan/prediction_data.cu
+      APPEND_STRING
+      PROPERTY COMPILE_FLAGS
+      " -Xcompiler=-Wno-maybe-uninitialized"
+    )
   endif()
 
   if(all_algo OR holtwinters_algo)
diff --git a/cpp/src/hdbscan/condensed_hierarchy.cu b/cpp/src/hdbscan/condensed_hierarchy.cu
index 76f1a19cf8..5744bc51c8 100644
--- a/cpp/src/hdbscan/condensed_hierarchy.cu
+++ b/cpp/src/hdbscan/condensed_hierarchy.cu
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021-2024, NVIDIA CORPORATION.
+ * Copyright (c) 2021-2025, NVIDIA CORPORATION.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -27,6 +27,7 @@
 
 #include <cub/cub.cuh>
 #include <cuda/functional>
+#include <cuda/std/functional>
 #include <thrust/copy.h>
 #include <thrust/device_ptr.h>
 #include <thrust/execution_policy.h>
@@ -157,8 +158,9 @@ void CondensedHierarchy<value_idx, value_t>::condense(value_idx* full_parents,
     thrust::cuda::par.on(stream),
     full_sizes,
     full_sizes + size,
-    cuda::proclaim_return_type<bool>([=] __device__(value_idx a) -> bool { return a != -1; }),
-    0,
+    cuda::proclaim_return_type<value_idx>(
+      [=] __device__(value_idx a) -> value_idx { return static_cast<value_idx>(a != -1); }),
+    static_cast<value_idx>(0),
     thrust::plus<value_idx>());
 
   parents.resize(n_edges, stream);
diff --git a/cpp/src/hdbscan/detail/utils.h b/cpp/src/hdbscan/detail/utils.h
index b151628429..4456416a6f 100644
--- a/cpp/src/hdbscan/detail/utils.h
+++ b/cpp/src/hdbscan/detail/utils.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021-2024, NVIDIA CORPORATION.
+ * Copyright (c) 2021-2025, NVIDIA CORPORATION.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -34,6 +34,7 @@
 #include <rmm/exec_policy.hpp>
 
 #include <cub/cub.cuh>
+#include <cuda/functional>
 #include <thrust/copy.h>
 #include <thrust/execution_policy.h>
 #include <thrust/for_each.h>
@@ -114,8 +115,9 @@ Common::CondensedHierarchy<value_idx, value_t> make_cluster_tree(
     thrust_policy,
     sizes,
     sizes + condensed_tree.get_n_edges(),
-    cuda::proclaim_return_type<bool>([=] __device__(value_idx a) -> bool { return a > 1; }),
-    0,
+    cuda::proclaim_return_type<value_idx>(
+      [=] __device__(value_idx a) -> value_idx { return static_cast<value_idx>(a > 1); }),
+    static_cast<value_idx>(0),
     thrust::plus<value_idx>());
 
   // remove leaves from condensed tree
diff --git a/cpp/test/CMakeLists.txt b/cpp/test/CMakeLists.txt
index 0576217965..28cca7baac 100644
--- a/cpp/test/CMakeLists.txt
+++ b/cpp/test/CMakeLists.txt
@@ -1,5 +1,5 @@
 #=============================================================================
-# Copyright (c) 2018-2024, NVIDIA CORPORATION.
+# Copyright (c) 2018-2025, NVIDIA CORPORATION.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -149,6 +149,12 @@ if("${CMAKE_CUDA_COMPILER_VERSION}" VERSION_GREATER_EQUAL "11.2")
     # An HDBSCAN gtest is failing w/ CUDA 11.2 for some reason.
     if(all_algo OR hdbscan_algo)
       ConfigureTest(PREFIX SG NAME HDBSCAN_TEST  sg/hdbscan_test.cu ML_INCLUDE)
+      set_property(
+        SOURCE sg/hdbscan_test.cu
+        APPEND_STRING
+        PROPERTY COMPILE_FLAGS
+        " -Xcompiler=-Wno-maybe-uninitialized"
+      )
     endif()
 endif()