diff --git a/src/txmempool.cpp b/src/txmempool.cpp
index b1fff87d1..af81e5c44 100644
--- a/src/txmempool.cpp
+++ b/src/txmempool.cpp
@@ -1021,7 +1021,7 @@ bool CTxMemPool::HasNoInputsOf(const CTransaction &tx) const
     return true;
 }
 
-CCoinsViewMemPool::CCoinsViewMemPool(CCoinsView *baseIn, CTxMemPool &mempoolIn) : CCoinsViewBacked(baseIn), mempool(mempoolIn) { }
+CCoinsViewMemPool::CCoinsViewMemPool(CCoinsView* baseIn, const CTxMemPool& mempoolIn) : CCoinsViewBacked(baseIn), mempool(mempoolIn) { }
 
 bool CCoinsViewMemPool::GetCoin(const COutPoint &outpoint, Coin &coin) const {
     // If an entry in the mempool exists, always return that one, as it's guaranteed to never
diff --git a/src/txmempool.h b/src/txmempool.h
index d83510b96..d3cea6e8a 100644
--- a/src/txmempool.h
+++ b/src/txmempool.h
@@ -718,10 +718,10 @@ private:
 class CCoinsViewMemPool : public CCoinsViewBacked
 {
 protected:
-    CTxMemPool &mempool;
+    const CTxMemPool& mempool;
 
 public:
-    CCoinsViewMemPool(CCoinsView *baseIn, CTxMemPool &mempoolIn);
+    CCoinsViewMemPool(CCoinsView* baseIn, const CTxMemPool& mempoolIn);
     bool GetCoin(const COutPoint &outpoint, Coin &coin) const override;
 };