diff --git a/src/kernel/CMakeLists.txt b/src/kernel/CMakeLists.txt
index b9f37969d37..211b8d84cc2 100644
--- a/src/kernel/CMakeLists.txt
+++ b/src/kernel/CMakeLists.txt
@@ -80,9 +80,25 @@ add_library(bitcoinkernel
   ../validationinterface.cpp
   ../versionbits.cpp
 )
+
+# Compiler warnings that apply only to the kernel and its dependencies.
+# These can be more strict and/or warnings that only apply to shared
+# libs.
+add_library(kernel_warn_interface INTERFACE)
+if(MSVC)
+else()
+  try_append_cxx_flags("-Wunique-object-duplication" TARGET kernel_warn_interface SKIP_LINK)
+endif()
+
+# Also manually apply the warnings to the kernel's internal dependencies
+target_link_libraries(bitcoin_clientversion PRIVATE kernel_warn_interface)
+target_link_libraries(bitcoin_crypto PRIVATE kernel_warn_interface)
+target_link_libraries(leveldb PRIVATE kernel_warn_interface)
+
 target_link_libraries(bitcoinkernel
   PRIVATE
     core_interface
+    kernel_warn_interface
     bitcoin_clientversion
     bitcoin_crypto
     leveldb
diff --git a/src/support/lockedpool.cpp b/src/support/lockedpool.cpp
index 01eef2b93d3..c27f900d021 100644
--- a/src/support/lockedpool.cpp
+++ b/src/support/lockedpool.cpp
@@ -400,3 +400,10 @@ void LockedPoolManager::CreateInstance()
     static LockedPoolManager instance(std::move(allocator));
     LockedPoolManager::_instance = &instance;
 }
+
+LockedPoolManager& LockedPoolManager::Instance()
+{
+    static std::once_flag init_flag;
+    std::call_once(init_flag, LockedPoolManager::CreateInstance);
+    return *LockedPoolManager::_instance;
+}
diff --git a/src/support/lockedpool.h b/src/support/lockedpool.h
index 2363b1e4ef0..a7d80df8766 100644
--- a/src/support/lockedpool.h
+++ b/src/support/lockedpool.h
@@ -219,12 +219,7 @@ class LockedPoolManager : public LockedPool
 {
 public:
     /** Return the current instance, or create it once */
-    static LockedPoolManager& Instance()
-    {
-        static std::once_flag init_flag;
-        std::call_once(init_flag, LockedPoolManager::CreateInstance);
-        return *LockedPoolManager::_instance;
-    }
+    static LockedPoolManager& Instance();
 
 private:
     explicit LockedPoolManager(std::unique_ptr<LockedPageAllocator> allocator);