diff --git a/src/main.cpp b/src/main.cpp
index 09f82312a..981d98771 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -3398,7 +3398,7 @@ static bool AcceptBlockHeader(const CBlockHeader& block, CValidationState& state
 }
 
 /** Store block on disk. If dbp is non-NULL, the file is known to already reside on disk */
-static bool AcceptBlock(const CBlock& block, CValidationState& state, const CChainParams& chainparams, CBlockIndex** ppindex, bool fRequested, CDiskBlockPos* dbp)
+static bool AcceptBlock(const CBlock& block, CValidationState& state, const CChainParams& chainparams, CBlockIndex** ppindex, bool fRequested, const CDiskBlockPos* dbp)
 {
     AssertLockHeld(cs_main);
 
@@ -3474,7 +3474,7 @@ static bool IsSuperMajority(int minVersion, const CBlockIndex* pstart, unsigned
 }
 
 
-bool ProcessNewBlock(CValidationState& state, const CChainParams& chainparams, const CNode* pfrom, const CBlock* pblock, bool fForceProcessing, CDiskBlockPos* dbp)
+bool ProcessNewBlock(CValidationState& state, const CChainParams& chainparams, const CNode* pfrom, const CBlock* pblock, bool fForceProcessing, const CDiskBlockPos* dbp)
 {
     {
         LOCK(cs_main);
diff --git a/src/main.h b/src/main.h
index 576f73b5f..f287171f1 100644
--- a/src/main.h
+++ b/src/main.h
@@ -212,10 +212,10 @@ void UnregisterNodeSignals(CNodeSignals& nodeSignals);
  * @param[in]   pfrom   The node which we are receiving the block from; it is added to mapBlockSource and may be penalised if the block is invalid.
  * @param[in]   pblock  The block we want to process.
  * @param[in]   fForceProcessing Process this block even if unrequested; used for non-network block sources and whitelisted peers.
- * @param[out]  dbp     If pblock is stored to disk (or already there), this will be set to its location.
+ * @param[out]  dbp     The already known disk position of pblock, or NULL if not yet stored.
  * @return True if state.IsValid()
  */
-bool ProcessNewBlock(CValidationState& state, const CChainParams& chainparams, const CNode* pfrom, const CBlock* pblock, bool fForceProcessing, CDiskBlockPos* dbp);
+bool ProcessNewBlock(CValidationState& state, const CChainParams& chainparams, const CNode* pfrom, const CBlock* pblock, bool fForceProcessing, const CDiskBlockPos* dbp);
 /** Check whether enough disk space is available for an incoming block */
 bool CheckDiskSpace(uint64_t nAdditionalBytes = 0);
 /** Open a block file (blk?????.dat) */