diff --git a/src/main.cpp b/src/main.cpp
index 972ea3de0..ad4782ff4 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -2202,7 +2202,8 @@ bool CBlock::AcceptBlock(CValidationState &state, CDiskBlockPos *dbp)
                 (fTestNet && CBlockIndex::IsSuperMajority(2, pindexPrev, 51, 100)))
             {
                 CScript expect = CScript() << nHeight;
-                if (!std::equal(expect.begin(), expect.end(), vtx[0].vin[0].scriptSig.begin()))
+                if (vtx[0].vin[0].scriptSig.size() < expect.size() ||
+                    !std::equal(expect.begin(), expect.end(), vtx[0].vin[0].scriptSig.begin()))
                     return state.DoS(100, error("AcceptBlock() : block height mismatch in coinbase"));
             }
         }