diff --git a/blockchain/fullblocktests/generate.go b/blockchain/fullblocktests/generate.go
index 82d3a036..aee67810 100644
--- a/blockchain/fullblocktests/generate.go
+++ b/blockchain/fullblocktests/generate.go
@@ -31,7 +31,7 @@ const (
 	// Intentionally defined here rather than using constants from codebase
 	// to ensure consensus changes are detected.
 	maxBlockSigOps       = 20000
-	maxBlockSize         = 1000000
+	maxBlockSize         = 2000000
 	minCoinbaseScriptLen = 2
 	maxCoinbaseScriptLen = 100
 	medianTimeBlocks     = 11
diff --git a/blockchain/weight.go b/blockchain/weight.go
index 6f6292a1..e23dd87d 100644
--- a/blockchain/weight.go
+++ b/blockchain/weight.go
@@ -24,7 +24,7 @@ const (
 
 	// MaxBlockBaseSize is the maximum number of bytes within a block
 	// which can be allocated to non-witness data.
-	MaxBlockBaseSize = 1000000
+	MaxBlockBaseSize = 2000000
 
 	// MaxBlockSigOpsCost is the maximum number of signature operations
 	// allowed for a block. It is calculated via a weighted algorithm which