diff --git a/cmd/flags/prover.go b/cmd/flags/prover.go
index 0e533270f..e095b439f 100644
--- a/cmd/flags/prover.go
+++ b/cmd/flags/prover.go
@@ -22,16 +22,17 @@ var (
 		Category: proverCategory,
 		EnvVars:  []string{"PROVER_CAPACITY"},
 	}
-)
-
-// Optional flags used by prover.
-var (
 	RaikoHostEndpoint = &cli.StringFlag{
 		Name:     "raiko.host",
 		Usage:    "RPC endpoint of a Raiko host service",
+		Required: true,
 		Category: proverCategory,
 		EnvVars:  []string{"RAIKO_HOST"},
 	}
+)
+
+// Optional flags used by prover.
+var (
 	RaikoL1Endpoint = &cli.StringFlag{
 		Name:     "raiko.l1",
 		Usage:    "L1 RPC endpoint which will be sent to the Raiko service",