diff --git a/src/interfaces/chain.h b/src/interfaces/chain.h
index 7cac435e96..bd259cb6b5 100644
--- a/src/interfaces/chain.h
+++ b/src/interfaces/chain.h
@@ -35,7 +35,9 @@ namespace interfaces {
 class Handler;
 class Wallet;
 
-//! Helper for findBlock to selectively return pieces of block data.
+//! Helper for findBlock to selectively return pieces of block data. If block is
+//! found, data will be returned by setting specified output variables. If block
+//! is not found, output variables will keep their previous values.
 class FoundBlock
 {
 public:
@@ -60,6 +62,7 @@ public:
     bool* m_in_active_chain = nullptr;
     const FoundBlock* m_next_block = nullptr;
     CBlock* m_data = nullptr;
+    mutable bool found = false;
 };
 
 //! Interface giving clients (wallet processes, maybe other analysis tools in
diff --git a/src/node/interfaces.cpp b/src/node/interfaces.cpp
index 183b5a5d91..eef4ce1c6c 100644
--- a/src/node/interfaces.cpp
+++ b/src/node/interfaces.cpp
@@ -334,6 +334,7 @@ bool FillBlock(const CBlockIndex* index, const FoundBlock& block, UniqueLock<Rec
         REVERSE_LOCK(lock);
         if (!ReadBlockFromDisk(*block.m_data, index, Params().GetConsensus())) block.m_data->SetNull();
     }
+    block.found = true;
     return true;
 }