diff --git a/src/chainparams.h b/src/chainparams.h
index cb061d596..8aa0c71d6 100644
--- a/src/chainparams.h
+++ b/src/chainparams.h
@@ -65,7 +65,7 @@ public:
     /** Policy: Filter transactions that do not match well-defined patterns */
     bool RequireStandard() const { return fRequireStandard; }
     int64_t MaxTipAge() const { return nMaxTipAge; }
-    int64_t PruneAfterHeight() const { return nPruneAfterHeight; }
+    uint64_t PruneAfterHeight() const { return nPruneAfterHeight; }
     /** Make miner stop after a block is found. In RPC, don't return until nGenProcLimit blocks are generated */
     bool MineBlocksOnDemand() const { return fMineBlocksOnDemand; }
     /** In the future use NetworkIDString() for RPC fields */
diff --git a/src/main.cpp b/src/main.cpp
index 31913956b..901a34bde 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -3290,7 +3290,7 @@ void FindFilesToPrune(std::set<int>& setFilesToPrune, uint64_t nPruneAfterHeight
     if (chainActive.Tip() == NULL || nPruneTarget == 0) {
         return;
     }
-    if (chainActive.Tip()->nHeight <= nPruneAfterHeight) {
+    if ((uint64_t)chainActive.Tip()->nHeight <= nPruneAfterHeight) {
         return;
     }
 
diff --git a/src/main.h b/src/main.h
index 3dec613fc..bdbfa3826 100644
--- a/src/main.h
+++ b/src/main.h
@@ -222,7 +222,7 @@ CAmount GetBlockSubsidy(int nHeight, const Consensus::Params& consensusParams);
  *
  * Pruning functions are called from FlushStateToDisk when the global fCheckForPruning flag has been set.
  * Block and undo files are deleted in lock-step (when blk00003.dat is deleted, so is rev00003.dat.)
- * Pruning cannot take place until the longest chain is at least a certain length (100000 on mainnet, 1000 on testnet, 10 on regtest).
+ * Pruning cannot take place until the longest chain is at least a certain length (100000 on mainnet, 1000 on testnet, 1000 on regtest).
  * Pruning will never delete a block within a defined distance (currently 288) from the active chain's tip.
  * The block index is updated by unsetting HAVE_DATA and HAVE_UNDO for any blocks that were stored in the deleted files.
  * A db flag records the fact that at least some block files have been pruned.