diff --git a/src/main.cpp b/src/main.cpp
index 9d0125698..4236e3571 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1220,8 +1220,8 @@ bool ContextualCheckTransaction(int32_t slowflag,const CBlock *block, CBlockInde
         const int dosLevel,
         bool (*isInitBlockDownload)(),int32_t validateprices)
 {
-    const bool overwinterActive = true; //NetworkUpgradeActive(nHeight, Params().GetConsensus(), Consensus::UPGRADE_OVERWINTER);
-    const bool saplingActive    = true; //NetworkUpgradeActive(nHeight, Params().GetConsensus(), Consensus::UPGRADE_SAPLING);
+    const bool overwinterActive = nHeight >=1 ? true : false; //NetworkUpgradeActive(nHeight, Params().GetConsensus(), Consensus::UPGRADE_OVERWINTER);
+    const bool saplingActive    = nHeight >=1 ? true : false; //NetworkUpgradeActive(nHeight, Params().GetConsensus(), Consensus::UPGRADE_SAPLING);
     const bool isSprout         = false; //!overwinterActive;
 
     // If Sprout rules apply, reject transactions which are intended for Overwinter and beyond