diff --git a/pkg/expr/nodes.go b/pkg/expr/nodes.go
index e8914c0e7ff..76be62b1def 100644
--- a/pkg/expr/nodes.go
+++ b/pkg/expr/nodes.go
@@ -19,7 +19,7 @@ var (
 	logger = log.New("expr")
 )
 
-// baseNode includes commmon properties used across DPNodes.
+// baseNode includes common properties used across DPNodes.
 type baseNode struct {
 	id    int64
 	refID string