diff --git a/mining.go b/mining.go
index 4f78db9c..34fa0bf9 100644
--- a/mining.go
+++ b/mining.go
@@ -48,7 +48,8 @@ const (
 	// are more strict.
 	standardScriptVerifyFlags = btcscript.ScriptBip16 |
 		btcscript.ScriptCanonicalSignatures |
-		btcscript.ScriptStrictMultiSig
+		btcscript.ScriptStrictMultiSig |
+		btcscript.ScriptDiscourageUpgradableNops
 )
 
 // txPrioItem houses a transaction along with extra information that allows the