diff --git a/pkg/apis/configuration/validation/validation.go b/pkg/apis/configuration/validation/validation.go
index 63142f6af3..b63a6fa2da 100644
--- a/pkg/apis/configuration/validation/validation.go
+++ b/pkg/apis/configuration/validation/validation.go
@@ -845,7 +845,7 @@ func validateActionReturnBody(body string, fieldPath *field.Path) field.ErrorLis
 }
 
 var actionReturnTypeFmt = `([^;\{\}"\\]|\\.)*`
-var actionReturnTypeErr = `must have all '"' (double quotes) escaped, must not contain '{', '}' or ';' and must not end with an unescaped '\' (backslash)`
+var actionReturnTypeErr = `must have all '"' (double quotes), '{', '}' or ';' escaped and must not end with an unescaped '\' (backslash)`
 
 var actionReturnTypeRegexp = regexp.MustCompile("^" + actionReturnTypeFmt + "$")