diff --git a/src/validation.cpp b/src/validation.cpp
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -1917,12 +1917,12 @@
         fStrictPayToScriptHash ? SCRIPT_VERIFY_P2SH : SCRIPT_VERIFY_NONE;
 
     // Start enforcing the DERSIG (BIP66) rule
-    if (pindex->nHeight >= consensusparams.BIP66Height) {
+    if ((pindex->pprev->nHeight + 1) >= consensusparams.BIP66Height) {
         flags |= SCRIPT_VERIFY_DERSIG;
     }
 
     // Start enforcing CHECKLOCKTIMEVERIFY (BIP65) rule
-    if (pindex->nHeight >= consensusparams.BIP65Height) {
+    if ((pindex->pprev->nHeight + 1) >= consensusparams.BIP65Height) {
         flags |= SCRIPT_VERIFY_CHECKLOCKTIMEVERIFY;
     }