diff --git a/internal/config/validate.go b/internal/config/validate.go
index 393ff9d29761a6763cfdd8e200c0433b758c4430..7b118a05cec5d094cdddb67eb8ba23f9d9c8e6a7 100644
--- a/internal/config/validate.go
+++ b/internal/config/validate.go
@@ -1,6 +1,7 @@
 package config
 
 import (
+	"errors"
 	"net/url"
 
 	log "github.com/sirupsen/logrus"
@@ -9,6 +10,7 @@ import (
 )
 
 func validateConfig(config *Config) {
+	validateDomainConfigSource()
 	validateAuthConfig(config)
 	validateArtifactsServerConfig(config)
 	validateTLSConfig()
@@ -61,3 +63,9 @@ func validateTLSConfig() {
 		fatal(err, "invalid TLS version")
 	}
 }
+
+func validateDomainConfigSource() {
+	if *domainConfigSource != "" {
+		fatal(errors.New("DEPRECATED: -domain-config-source"), "Please use API-based configuration https://docs.gitlab.com/ee/administration/pages/#gitlab-api-based-configuration")
+	}
+}