diff --git a/libpurgeablemem/cpp/include/purgeable_resource_manager.h b/libpurgeablemem/cpp/include/purgeable_resource_manager.h
index 1f40ea767bc8a8899343927da8d28416f7bffd1b..863fee27feca92e16ae859c74a028de788ff66c8 100644
--- a/libpurgeablemem/cpp/include/purgeable_resource_manager.h
+++ b/libpurgeablemem/cpp/include/purgeable_resource_manager.h
@@ -89,7 +89,7 @@ private:
         size_t Size() const;
 
     private:
-        int32_t lruCacheCapacity_;
+        size_t lruCacheCapacity_ = 0;
         std::list<std::shared_ptr<PurgeableMemBase>> resourcePtrList_;
         std::unordered_map<std::shared_ptr<PurgeableMemBase>, ListSharedPtrIterator> positionMap_;
     };
diff --git a/libpurgeablemem/cpp/src/purgeable_resource_manager.cpp b/libpurgeablemem/cpp/src/purgeable_resource_manager.cpp
index cd40cb986f9e7e51dec84ac24a2678e7f491d6f4..c111ced7d9951ed47f64123a8ebfd59010d741e6 100644
--- a/libpurgeablemem/cpp/src/purgeable_resource_manager.cpp
+++ b/libpurgeablemem/cpp/src/purgeable_resource_manager.cpp
@@ -57,7 +57,7 @@ void PurgeableResourceManager::LruCache::Insert(std::shared_ptr<PurgeableMemBase
 
     resourcePtrList_.emplace_front(key);
     positionMap_.emplace(key, resourcePtrList_.begin());
-    if (static_cast<int32_t>(resourcePtrList_.size()) > lruCacheCapacity_) {
+    if (resourcePtrList_.size() > lruCacheCapacity_) {
         auto popResource = resourcePtrList_.back();
         if (popResource->GetPinStatus() == 0) {
             popResource->Pin();
@@ -90,7 +90,7 @@ void PurgeableResourceManager::LruCache::SetCapacity(int32_t capacity)
     }
 
     lruCacheCapacity_ = capacity;
-    while (lruCacheCapacity_ < static_cast<int32_t>(Size())) {
+    while (lruCacheCapacity_ < Size()) {
         Erase(resourcePtrList_.back());
     }
 }