1 files changed, 7 insertions, 1 deletions

diff --git a/src/rpc.cpp b/src/rpc.cpp
index da22b1d..03d1f44 100644
--- a/src/rpc.cpp
+++ b/src/rpc.cpp
@@ -253,7 +253,13 @@ static bool RebuildJob()
                     pool = tmp;
                     block.vtx.push_back(tx);
                     sz += ::GetSerializeSize(tx, SER_NETWORK);
-                    if (sz > MAX_SIZE / 2) break;
+                    // Must stay under the consensus cap CheckBlock() enforces.
+                    // This is the pool's job builder, so a block over the cap
+                    // is not just one wasted solve -- it is every miner on the
+                    // pool working a template the network will reject. The
+                    // transaction is already pushed above, so this can overshoot
+                    // by one; half the cap leaves room for that.
+                    if (sz > MAX_BLOCK_SIZE / 2) break;
                 }
             }
         }