diff --git a/db/db_impl/db_impl.h b/db/db_impl/db_impl.h
index 89e1719a6..8f28b4af0 100644
--- a/db/db_impl/db_impl.h
+++ b/db/db_impl/db_impl.h
@@ -965,7 +965,7 @@ class DBImpl : public DB {
 
   // Return the maximum overlapping data (in bytes) at next level for any
   // file at a level >= 1.
-  int64_t TEST_MaxNextLevelOverlappingBytes(
+  uint64_t TEST_MaxNextLevelOverlappingBytes(
       ColumnFamilyHandle* column_family = nullptr);
 
   // Return the current manifest file no.
diff --git a/db/db_impl/db_impl_debug.cc b/db/db_impl/db_impl_debug.cc
index a9f22458e..821925f92 100644
--- a/db/db_impl/db_impl_debug.cc
+++ b/db/db_impl/db_impl_debug.cc
@@ -43,7 +43,7 @@ bool DBImpl::TEST_WALBufferIsEmpty(bool lock) {
   return res;
 }
 
-int64_t DBImpl::TEST_MaxNextLevelOverlappingBytes(
+uint64_t DBImpl::TEST_MaxNextLevelOverlappingBytes(
     ColumnFamilyHandle* column_family) {
   ColumnFamilyData* cfd;
   if (column_family == nullptr) {
diff --git a/db/version_set.cc b/db/version_set.cc
index cd79cc205..660b46985 100644
--- a/db/version_set.cc
+++ b/db/version_set.cc
@@ -3390,7 +3390,7 @@ const char* VersionStorageInfo::LevelFileSummary(FileSummaryStorage* scratch,
   return scratch->buffer;
 }
 
-int64_t VersionStorageInfo::MaxNextLevelOverlappingBytes() {
+uint64_t VersionStorageInfo::MaxNextLevelOverlappingBytes() {
   uint64_t result = 0;
   std::vector<FileMetaData*> overlaps;
   for (int level = 1; level < num_levels() - 1; level++) {
diff --git a/db/version_set.h b/db/version_set.h
index c9f0e160f..22c0f4a97 100644
--- a/db/version_set.h
+++ b/db/version_set.h
@@ -447,7 +447,7 @@ class VersionStorageInfo {
 
   // Return the maximum overlapping data (in bytes) at next level for any
   // file at a level >= 1.
-  int64_t MaxNextLevelOverlappingBytes();
+  uint64_t MaxNextLevelOverlappingBytes();
 
   // Return a human readable string that describes this version's contents.
   std::string DebugString(bool hex = false) const;