diff --git a/.pending/breaking/sdk/4525-Remove---cors-f b/.pending/breaking/sdk/4525-Remove---cors-f
new file mode 100644
index 000000000..8bf5fa98a
--- /dev/null
+++ b/.pending/breaking/sdk/4525-Remove---cors-f
@@ -0,0 +1 @@
+#4525 Remove --cors flag, the feature is long gone.
diff --git a/client/alias.go b/client/alias.go
index 5a7de1a14..5ce2ab057 100644
--- a/client/alias.go
+++ b/client/alias.go
@@ -51,7 +51,6 @@ const (
 	FlagGenerateOnly       = flags.FlagGenerateOnly
 	FlagIndentResponse     = flags.FlagIndentResponse
 	FlagListenAddr         = flags.FlagListenAddr
-	FlagCORS               = flags.FlagCORS
 	FlagMaxOpenConnections = flags.FlagMaxOpenConnections
 	FlagRPCReadTimeout     = flags.FlagRPCReadTimeout
 	FlagRPCWriteTimeout    = flags.FlagRPCWriteTimeout
diff --git a/client/flags/flags.go b/client/flags/flags.go
index 8f7a9e837..f9e934dbd 100644
--- a/client/flags/flags.go
+++ b/client/flags/flags.go
@@ -50,7 +50,6 @@ const (
 	FlagGenerateOnly       = "generate-only"
 	FlagIndentResponse     = "indent"
 	FlagListenAddr         = "laddr"
-	FlagCORS               = "cors"
 	FlagMaxOpenConnections = "max-open"
 	FlagRPCReadTimeout     = "read-timeout"
 	FlagRPCWriteTimeout    = "write-timeout"
@@ -122,7 +121,6 @@ func PostCommands(cmds ...*cobra.Command) []*cobra.Command {
 func RegisterRestServerFlags(cmd *cobra.Command) *cobra.Command {
 	cmd = GetCommands(cmd)[0]
 	cmd.Flags().String(FlagListenAddr, "tcp://localhost:1317", "The address for the server to listen on")
-	cmd.Flags().String(FlagCORS, "", "Set the domains that can make CORS requests (* for all)")
 	cmd.Flags().Uint(FlagMaxOpenConnections, 1000, "The number of maximum open connections")
 	cmd.Flags().Uint(FlagRPCReadTimeout, 10, "The RPC read timeout (in seconds)")
 	cmd.Flags().Uint(FlagRPCWriteTimeout, 10, "The RPC write timeout (in seconds)")