diff --git a/frontend/dockerfile/linter/ruleset.go b/frontend/dockerfile/linter/ruleset.go
index 175735274011c..773288adc39a1 100644
--- a/frontend/dockerfile/linter/ruleset.go
+++ b/frontend/dockerfile/linter/ruleset.go
@@ -18,7 +18,7 @@ var (
 		Description: "The AS keyword should match the case of the FROM keyword",
 		URL:         "https://docs.docker.com/go/dockerfile/rule/from-as-casing/",
 		Format: func(from, as string) string {
-			return fmt.Sprintf("'%s' and '%s' keywords casing do not match", as, from)
+			return fmt.Sprintf("Casing mismatch: keywords '%s' and '%s' should match in case", from, as)
 		},
 	}
 	RuleNoEmptyContinuation = LinterRule[func() string]{