diff --git a/.arcconfig b/.arcconfig
index 19895cdfd818..2c80d58b7b23 100644
--- a/.arcconfig
+++ b/.arcconfig
@@ -1,5 +1,4 @@
 {
 	"repository.callsign" : "P",
-	"phabricator.uri" : "https://reviews.freebsd.org/",
-	"history.immutable" : true
+	"phabricator.uri" : "https://reviews.freebsd.org/"
 }