diff --git a/src/chainparams.cpp b/src/chainparams.cpp
--- a/src/chainparams.cpp
+++ b/src/chainparams.cpp
@@ -322,7 +322,7 @@
             "000000000005b07ecf85563034d13efd81c1a29e47e22b20f4fc6919d5b09cd6");
 
         // August 1, 2017 hard fork
-        consensus.uahfHeight = 1155876;
+        consensus.uahfHeight = 1155875;
 
         // November 13, 2017 hard fork
         consensus.daaHeight = 1188697;
@@ -392,8 +392,8 @@
                 {546, uint256S("000000002a936ca763904c3c35fce2f3556c559c0214345"
                                "d31b1bcebf76acb70")},
                 // UAHF fork block.
-                {1155876, uint256S("00000000000e38fef93ed9582a7df43815d5c2ba9fd"
-                                   "37ef70c9a0ea4a285b8f5")},
+                {1155875, uint256S("00000000f17c850672894b9a75b63a1e72830bbd5f4"
+                                   "c8889b5c1a80e7faef138")},
                 // Nov, 13. DAA activation block.
                 {1188697, uint256S("0000000000170ed0918077bde7b4d36cc4c91be69fa"
                                    "09211f748240dabe047fb")},
diff --git a/src/validation.cpp b/src/validation.cpp
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -1390,8 +1390,9 @@
 
 static void InvalidChainFound(CBlockIndex *pindexNew) {
     if (!pindexBestInvalid ||
-        pindexNew->nChainWork > pindexBestInvalid->nChainWork)
+        pindexNew->nChainWork > pindexBestInvalid->nChainWork) {
         pindexBestInvalid = pindexNew;
+    }
 
     LogPrintf(
         "%s: invalid block=%s  height=%d  log2_work=%.8g  date=%s\n", __func__,
@@ -2113,7 +2114,7 @@
 
     // FIXME: This should be called with pindex->pprev, to match the result
     // given to AcceptToMemoryPoolWorker: https://reviews.bitcoinabc.org/T288
-    uint32_t flags = GetBlockScriptFlags(pindex, config);
+    const uint32_t flags = GetBlockScriptFlags(pindex, config);
 
     int64_t nTime2 = GetTimeMicros();
     nTimeForks += nTime2 - nTime1;
@@ -2762,8 +2763,9 @@
             if (state.IsInvalid()) {
                 InvalidBlockFound(pindexNew, state);
             }
-            return error("ConnectTip(): ConnectBlock %s failed",
-                         pindexNew->GetBlockHash().ToString());
+            return error("ConnectTip(): ConnectBlock %s failed (%s)",
+                         pindexNew->GetBlockHash().ToString(),
+                         FormatStateMessage(state));
         }
         nTime3 = GetTimeMicros();
         nTimeConnectTotal += nTime3 - nTime2;