diff --git a/promql/lex.go b/promql/lex.go
index 2d4f6819f..de2df838e 100644
--- a/promql/lex.go
+++ b/promql/lex.go
@@ -18,8 +18,6 @@ import (
 	"strings"
 	"unicode"
 	"unicode/utf8"
-
-	"github.com/prometheus/common/log"
 )
 
 // item represents a token or text string returned from the scanner.
@@ -194,11 +192,6 @@ const (
 	itemGroupLeft
 	itemGroupRight
 	itemBool
-	// Removed keywords. Just here to detect and print errors.
-	itemSummary
-	itemDescription
-	itemRunbook
-	itemKeepExtra
 	keywordsEnd
 )
 
@@ -234,11 +227,6 @@ var key = map[string]itemType{
 	"group_left":  itemGroupLeft,
 	"group_right": itemGroupRight,
 	"bool":        itemBool,
-	// Removed keywords. Just here to detect and print errors.
-	"summary":       itemSummary,
-	"description":   itemDescription,
-	"runbook":       itemRunbook,
-	"keeping_extra": itemKeepExtra,
 }
 
 // These are the default string representations for common items. It does not
@@ -429,14 +417,6 @@ func (l *lexer) errorf(format string, args ...interface{}) stateFn {
 func (l *lexer) nextItem() item {
 	item := <-l.items
 	l.lastPos = item.pos
-
-	// TODO(fabxc): remove for version 1.0.
-	t := item.typ
-	if t == itemSummary || t == itemDescription || t == itemRunbook {
-		log.Errorf("Token %q is not valid anymore. Alerting rule syntax has changed with version 0.17.0. Please read https://prometheus.io/docs/alerting/rules/.", item)
-	} else if t == itemKeepExtra {
-		log.Error("Token 'keeping_extra' is not valid anymore. Use 'keep_common' instead.")
-	}
 	return item
 }