diff --git a/src/main.cpp b/src/main.cpp
index 7a6d4b39de2..dc584416eee 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -74,53 +74,54 @@ const string strMessageMagic = "Bitcoin Signed Message:\n";
 
 // Internal stuff
 namespace {
-struct CBlockIndexWorkComparator
-{
-    bool operator()(CBlockIndex *pa, CBlockIndex *pb) {
-        // First sort by most total work, ...
-        if (pa->nChainWork > pb->nChainWork) return false;
-        if (pa->nChainWork < pb->nChainWork) return true;
+    struct CBlockIndexWorkComparator
+    {
+        bool operator()(CBlockIndex *pa, CBlockIndex *pb) {
+            // First sort by most total work, ...
+            if (pa->nChainWork > pb->nChainWork) return false;
+            if (pa->nChainWork < pb->nChainWork) return true;
 
-        // ... then by earliest time received, ...
-        if (pa->nSequenceId < pb->nSequenceId) return false;
-        if (pa->nSequenceId > pb->nSequenceId) return true;
+            // ... then by earliest time received, ...
+            if (pa->nSequenceId < pb->nSequenceId) return false;
+            if (pa->nSequenceId > pb->nSequenceId) return true;
 
-        // Use pointer address as tie breaker (should only happen with blocks
-        // loaded from disk, as those all have id 0).
-        if (pa < pb) return false;
-        if (pa > pb) return true;
+            // Use pointer address as tie breaker (should only happen with blocks
+            // loaded from disk, as those all have id 0).
+            if (pa < pb) return false;
+            if (pa > pb) return true;
 
-        // Identical blocks.
-        return false;
-    }
-};
-
-CBlockIndex *pindexBestInvalid;
-set<CBlockIndex*, CBlockIndexWorkComparator> setBlockIndexValid; // may contain all CBlockIndex*'s that have validness >=BLOCK_VALID_TRANSACTIONS, and must contain those who aren't failed
-
-CCriticalSection cs_LastBlockFile;
-CBlockFileInfo infoLastBlockFile;
-int nLastBlockFile = 0;
-
-// Every received block is assigned a unique and increasing identifier, so we
-// know which one to give priority in case of a fork.
-CCriticalSection cs_nBlockSequenceId;
-// Blocks loaded from disk are assigned id 0, so start the counter at 1.
-uint32_t nBlockSequenceId = 1;
-
-// Sources of received blocks, to be able to send them reject messages or ban
-// them, if processing happens afterwards. Protected by cs_main.
-map<uint256, NodeId> mapBlockSource;
-
-// Blocks that are in flight, and that are in the queue to be downloaded.
-// Protected by cs_main.
-struct QueuedBlock {
-    uint256 hash;
-    int64_t nTime;  // Time of "getdata" request in microseconds.
-    int nQueuedBefore;  // Number of blocks in flight at the time of request.
-};
-map<uint256, pair<NodeId, list<QueuedBlock>::iterator> > mapBlocksInFlight;
-map<uint256, pair<NodeId, list<uint256>::iterator> > mapBlocksToDownload;
+            // Identical blocks.
+            return false;
+        }
+    };
+
+    CBlockIndex *pindexBestInvalid;
+    // may contain all CBlockIndex*'s that have validness >=BLOCK_VALID_TRANSACTIONS, and must contain those who aren't failed
+    set<CBlockIndex*, CBlockIndexWorkComparator> setBlockIndexValid;
+
+    CCriticalSection cs_LastBlockFile;
+    CBlockFileInfo infoLastBlockFile;
+    int nLastBlockFile = 0;
+
+    // Every received block is assigned a unique and increasing identifier, so we
+    // know which one to give priority in case of a fork.
+    CCriticalSection cs_nBlockSequenceId;
+    // Blocks loaded from disk are assigned id 0, so start the counter at 1.
+    uint32_t nBlockSequenceId = 1;
+
+    // Sources of received blocks, to be able to send them reject messages or ban
+    // them, if processing happens afterwards. Protected by cs_main.
+    map<uint256, NodeId> mapBlockSource;
+
+    // Blocks that are in flight, and that are in the queue to be downloaded.
+    // Protected by cs_main.
+    struct QueuedBlock {
+        uint256 hash;
+        int64_t nTime;  // Time of "getdata" request in microseconds.
+        int nQueuedBefore;  // Number of blocks in flight at the time of request.
+    };
+    map<uint256, pair<NodeId, list<QueuedBlock>::iterator> > mapBlocksInFlight;
+    map<uint256, pair<NodeId, list<uint256>::iterator> > mapBlocksToDownload;
 }
 
 //////////////////////////////////////////////////////////////////////////////