diff --git a/src/main.go b/src/main.go
index 389da78..3c1480c 100644
--- a/src/main.go
+++ b/src/main.go
@@ -107,6 +107,11 @@ func main() {
 		if autoReceiveScheduleEnvVariableSet {
 			log.Fatal("Env variable AUTO_RECEIVE_SCHEDULE can't be used with mode json-rpc")
 		}
+
+		_, signalCliCommandTimeoutEnvVariableSet := os.LookupEnv("SIGNAL_CLI_CMD_TIMEOUT")
+		if signalCliCommandTimeoutEnvVariableSet {
+			log.Fatal("Env variable SIGNAL_CLI_CMD_TIMEOUT can't be used with mode json-rpc")
+		}
 	}