diff --git a/pkg/logql/log/dedup_filter.go b/pkg/logql/log/dedup_filter.go
index 4cc12bf3a1761..0825d22d4c13f 100644
--- a/pkg/logql/log/dedup_filter.go
+++ b/pkg/logql/log/dedup_filter.go
@@ -5,16 +5,16 @@ import (
 )
 
 type LineDedupFilter struct {
-	labels     map[string]interface{}
+	labels     map[string]struct{}
 	inverted   bool
 	hashLookup map[uint64]struct{}
 }
 
 func NewLineDedupFilter(labelFilters []string, inverted bool) *LineDedupFilter {
 	// create a map of labelFilters for O(1) lookups instead of O(n)
-	var filterMap = make(map[string]interface{})
+	var filterMap = make(map[string]struct{})
 	for _, group := range labelFilters {
-		filterMap[group] = nil
+		filterMap[group] = struct{}{}
 	}
 
 	return &LineDedupFilter{
diff --git a/pkg/logql/log/dedup_filter_test.go b/pkg/logql/log/dedup_filter_test.go
index e0b0d2d30451d..5ba3801015da0 100644
--- a/pkg/logql/log/dedup_filter_test.go
+++ b/pkg/logql/log/dedup_filter_test.go
@@ -119,7 +119,6 @@ func Test_Deduplication(t *testing.T) {
 
 			for _, entry := range entries {
 				b := NewBaseLabelsBuilder().ForLabels(*entry.lbs, entry.lbs.Hash())
-				b.Reset()
 
 				if line, ok := d.Process(entry.line, b); ok {
 					outLines = append(outLines, line)
@@ -142,7 +141,6 @@ func Benchmark_Deduplication(b *testing.B) {
 	}
 
 	lbs := NewBaseLabelsBuilder().ForLabels(l, l.Hash())
-	lbs.Reset()
 
 	line := randomLine(10)
 
diff --git a/pkg/logql/parser_test.go b/pkg/logql/parser_test.go
index 6f4bdad71e91f..33df96a097f51 100644
--- a/pkg/logql/parser_test.go
+++ b/pkg/logql/parser_test.go
@@ -747,20 +747,20 @@ func TestParse(t *testing.T) {
 		},
 		{
 			// missing "by" clause
-			in: `{foo="bar"} dedup (label)`,
+			in: `{foo="bar"} | dedup (label)`,
 			err: ParseError{
-				msg:  "syntax error: unexpected dedup",
+				msg:  "syntax error: unexpected (, expecting by or without",
 				line: 1,
-				col:  13,
+				col:  21,
 			},
 		},
 		{
 			// misspelling of "dedup"
-			in: `{foo="bar"} dedupe by (label)`,
+			in: `{foo="bar"} | dedupe by (label)`,
 			err: ParseError{
-				msg:  "syntax error: unexpected IDENTIFIER",
+				msg:  "syntax error: unexpected by",
 				line: 1,
-				col:  13,
+				col:  22,
 			},
 		},
 		{