diff --git a/src/dbwrapper.cpp b/src/dbwrapper.cpp
index fe0a2e66f2..58fd47ce1c 100644
--- a/src/dbwrapper.cpp
+++ b/src/dbwrapper.cpp
@@ -33,6 +33,8 @@
 #include <optional>
 #include <utility>
 
+static auto CharCast(const std::byte* data) { return reinterpret_cast<const char*>(data); }
+
 bool DestroyDB(const std::string& path_str)
 {
     return leveldb::DestroyDB(path_str, {}).ok();
@@ -340,6 +342,16 @@ bool CDBWrapper::ExistsImpl(Span<const std::byte> ssKey) const
     return true;
 }
 
+size_t CDBWrapper::EstimateSizeImpl(Span<const std::byte> ssKey1, Span<const std::byte> ssKey2) const
+{
+    leveldb::Slice slKey1(CharCast(ssKey1.data()), ssKey1.size());
+    leveldb::Slice slKey2(CharCast(ssKey2.data()), ssKey2.size());
+    uint64_t size = 0;
+    leveldb::Range range(slKey1, slKey2);
+    pdb->GetApproximateSizes(&range, 1, &size);
+    return size;
+}
+
 bool CDBWrapper::IsEmpty()
 {
     std::unique_ptr<CDBIterator> it(NewIterator());
diff --git a/src/dbwrapper.h b/src/dbwrapper.h
index 9756207aec..fa7b6397cb 100644
--- a/src/dbwrapper.h
+++ b/src/dbwrapper.h
@@ -12,17 +12,15 @@
 #include <util/fs.h>
 
 #include <cstddef>
-#include <cstdint>
 #include <exception>
-#include <leveldb/db.h>
 #include <leveldb/options.h>
-#include <leveldb/slice.h>
 #include <memory>
 #include <optional>
 #include <stdexcept>
 #include <string>
 #include <vector>
 namespace leveldb {
+class DB;
 class Env;
 }
 
@@ -52,8 +50,6 @@ struct DBParams {
     DBOptions options{};
 };
 
-inline auto CharCast(const std::byte* data) { return reinterpret_cast<const char*>(data); }
-
 class dbwrapper_error : public std::runtime_error
 {
 public:
@@ -231,6 +227,7 @@ private:
 
     std::optional<std::string> ReadImpl(Span<const std::byte> ssKey) const;
     bool ExistsImpl(Span<const std::byte> ssKey) const;
+    size_t EstimateSizeImpl(Span<const std::byte> ssKey1, Span<const std::byte> ssKey2) const;
 
 public:
     CDBWrapper(const DBParams& params);
@@ -312,12 +309,7 @@ public:
         ssKey2.reserve(DBWRAPPER_PREALLOC_KEY_SIZE);
         ssKey1 << key_begin;
         ssKey2 << key_end;
-        leveldb::Slice slKey1(CharCast(ssKey1.data()), ssKey1.size());
-        leveldb::Slice slKey2(CharCast(ssKey2.data()), ssKey2.size());
-        uint64_t size = 0;
-        leveldb::Range range(slKey1, slKey2);
-        pdb->GetApproximateSizes(&range, 1, &size);
-        return size;
+        return EstimateSizeImpl(ssKey1, ssKey2);
     }
 };