diff --git a/src/chainparams.cpp b/src/chainparams.cpp
index 55a6323049..fd8a90dbbd 100644
--- a/src/chainparams.cpp
+++ b/src/chainparams.cpp
@@ -538,6 +538,8 @@ class CTestNetParams : public CChainParams {
         consensus.nChainStartTime = 1389306217;
         consensus.BIP34Height = 21111;
         consensus.BIP34Hash = uint256S("0x0000000023b3a96d3484e5abb3755c413e7d41500f8e2a5c3f0dd01299cd8ef8");
+        consensus.BIP65Height = INT_MAX;
+        consensus.BIP66Height = INT_MAX;
         consensus.powLimit = uint256S("00ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff");
         consensus.nPowTargetTimespan = 60 * 60; // 60 minutes between retargets
         consensus.nPowTargetSpacing = 5 * 60; // 5 minute blocks
@@ -813,6 +815,8 @@ class CDevNetParams : public CChainParams {
         consensus.nChainStartTime = 1389306217;
         consensus.BIP34Height = 21111;
         consensus.BIP34Hash = uint256S("0x0000000023b3a96d3484e5abb3755c413e7d41500f8e2a5c3f0dd01299cd8ef8");
+        consensus.BIP65Height = INT_MAX;
+        consensus.BIP66Height = INT_MAX;
         consensus.powLimit = uint256S("00ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff");
         consensus.nPowTargetTimespan = 60 * 60; // 60 minutes between retargets
         consensus.nPowTargetSpacing = 5 * 60; // 5 minute blocks