diff --git a/src/block_cache.cpp b/src/block_cache.cpp
index 51a6a87..58ae89f 100644
--- a/src/block_cache.cpp
+++ b/src/block_cache.cpp
@@ -29,7 +29,7 @@ static constexpr char cache_name[] = "p2pool.cache";
 
 namespace p2pool {
 
-struct BlockCache::Impl
+struct BlockCache::Impl : public nocopy_nomove
 {
 #if defined(__linux__) || defined(__unix__) || defined(_POSIX_VERSION)
 
diff --git a/src/block_cache.h b/src/block_cache.h
index c5994e9..d9fd27b 100644
--- a/src/block_cache.h
+++ b/src/block_cache.h
@@ -23,7 +23,7 @@ struct PoolBlock;
 class SideChain;
 class P2PServer;
 
-class BlockCache
+class BlockCache : public nocopy_nomove
 {
 public:
 	BlockCache();