diff --git a/src/main.cpp b/src/main.cpp
index 8dcd3cc10..861fb7eab 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -3170,7 +3170,7 @@ bool ConnectBlock(const CBlock& block, CValidationState& state, CBlockIndex* pin
         //fprintf(stderr,"checkblock failure in connectblock futureblock.%d\n",futureblock);
         return false;
     }
-    if ( fCheckPOW != 0 && pindex->nTime > 1548979200 && !ContextualCheckBlock(block, state, pindex->pprev) ) // activate check Feb 1, 2019
+    if ( fCheckPOW != 0 && pindex->nTime > 1547510400 && !ContextualCheckBlock(block, state, pindex->pprev) ) // activate check Jan 15, 2019
     {
         fprintf(stderr,"ContextualCheckBlock failed ht.%d\n",(int32_t)pindex->GetHeight());
         return false;