diff --git a/src/block_cache.cpp b/src/block_cache.cpp
index 7b4791d..eb4c97f 100644
--- a/src/block_cache.cpp
+++ b/src/block_cache.cpp
@@ -183,7 +183,7 @@ void BlockCache::store(const PoolBlock& block)
 	memcpy(data + sizeof(uint32_t) + n1, sidechain_data.data(), n2);
 }
 
-void BlockCache::load_all(SideChain& side_chain, P2PServer& server)
+void BlockCache::load_all(const SideChain& side_chain, P2PServer& server)
 {
 	if (!m_impl->m_data) {
 		return;
diff --git a/src/block_cache.h b/src/block_cache.h
index 005430b..0c7dc33 100644
--- a/src/block_cache.h
+++ b/src/block_cache.h
@@ -30,7 +30,7 @@ public:
 	~BlockCache();
 
 	void store(const PoolBlock& block);
-	void load_all(SideChain& side_chain, P2PServer& server);
+	void load_all(const SideChain& side_chain, P2PServer& server);
 	void flush();
 
 private: