diff --git a/params/forks/forks.go b/params/forks/forks.go
index adb65c8624..641d59434b 100644
--- a/params/forks/forks.go
+++ b/params/forks/forks.go
@@ -45,6 +45,7 @@ const (
 	BPO3
 	BPO4
 	BPO5
+	Amsterdam
 )
 
 // String implements fmt.Stringer.
@@ -82,4 +83,5 @@ var forkToString = map[Fork]string{
 	BPO3:             "BPO3",
 	BPO4:             "BPO4",
 	BPO5:             "BPO5",
+	Amsterdam:        "Amsterdam",
 }