diff --git a/core/runtime/binaryen/memory_impl.cpp b/core/runtime/binaryen/memory_impl.cpp
index ff6f7c5a72..e73ff2feb3 100644
--- a/core/runtime/binaryen/memory_impl.cpp
+++ b/core/runtime/binaryen/memory_impl.cpp
@@ -13,10 +13,9 @@ namespace kagome::runtime::binaryen {
   MemoryImpl::MemoryImpl(RuntimeExternalInterface::InternalMemory *memory,
                          std::unique_ptr<MemoryAllocator> &&allocator)
       : memory_{memory},
-        size_{kInitialMemorySize},
         allocator_{std::move(allocator)},
         logger_{log::createLogger("Binaryen Memory", "binaryen")} {
-    resize(size_);
+    resize(kInitialMemorySize);
   }
 
   MemoryImpl::MemoryImpl(RuntimeExternalInterface::InternalMemory *memory,
@@ -26,7 +25,7 @@ namespace kagome::runtime::binaryen {
           std::make_unique<MemoryAllocator>(
               MemoryAllocator::MemoryHandle{
                   [this](auto new_size) { return resize(new_size); },
-                  [this]() { return size_; },
+                  [this]() { return size(); },
                   [this](auto addr, uint32_t value) {
                     memory_->set<uint32_t>(addr, value);
                   },
@@ -80,13 +79,13 @@ namespace kagome::runtime::binaryen {
 
   common::BufferView MemoryImpl::loadN(kagome::runtime::WasmPointer addr,
                                        kagome::runtime::WasmSize n) const {
-    BOOST_ASSERT(size_ > addr and size_ - addr >= n);
+    BOOST_ASSERT(size() > addr and size() - addr >= n);
     return common::BufferView{memory_->getBuffer<const uint8_t>(addr, n)};
   }
 
   std::string MemoryImpl::loadStr(kagome::runtime::WasmPointer addr,
                                   kagome::runtime::WasmSize length) const {
-    BOOST_ASSERT(size_ > addr and size_ - addr >= length);
+    BOOST_ASSERT(size() > addr and size() - addr >= length);
     std::string res;
     res.reserve(length);
     for (auto i = addr; i < addr + length; i++) {
diff --git a/core/runtime/binaryen/memory_impl.hpp b/core/runtime/binaryen/memory_impl.hpp
index f888646525..881ef8bdab 100644
--- a/core/runtime/binaryen/memory_impl.hpp
+++ b/core/runtime/binaryen/memory_impl.hpp
@@ -81,22 +81,21 @@ namespace kagome::runtime::binaryen {
        * We use this condition to avoid
        * deallocated_ pointers fixup
        */
-      if (new_size >= size_) {
+      if (new_size >= size()) {
         if (auto mod = new_size % kMemoryPageSize) {
           new_size += kMemoryPageSize - mod;
         }
-        size_ = new_size;
         memory_->resize(new_size);
       }
     }
 
     WasmSize size() const override {
-      return size_;
+      BOOST_ASSERT(memory_ != nullptr);
+      return memory_->getSize();
     }
 
    private:
     RuntimeExternalInterface::InternalMemory *memory_;
-    WasmSize size_;
     std::unique_ptr<MemoryAllocator> allocator_;
 
     log::Logger logger_;