diff --git a/v23/mkline.go b/v23/mkline.go
index b9ad413b..db8bbffe 100644
--- a/v23/mkline.go
+++ b/v23/mkline.go
@@ -845,12 +845,12 @@ func (mkline *MkLine) VariableNeedsQuoting(mklines *MkLines, expr *MkExpr, varty
 
 // ForEachUsed calls the action for each variable that is used in the line.
 func (mkline *MkLine) ForEachUsed(action func(expr *MkExpr, time EctxTime)) {
-	walker := NewMkWalker(mkline, action)
+	walker := NewMkWalker(action)
 	walker.WalkLine(mkline)
 }
 
 func (mkline *MkLine) ForEachUsedText(text string, time EctxTime, action func(expr *MkExpr, time EctxTime)) {
-	walker := NewMkWalker(mkline, action)
+	walker := NewMkWalker(action)
 	walker.WalkText(text, time)
 }
 
diff --git a/v23/mkwalker.go b/v23/mkwalker.go
index c12ea53d..633152d2 100644
--- a/v23/mkwalker.go
+++ b/v23/mkwalker.go
@@ -3,12 +3,11 @@ package pkglint
 // MkWalker walks through a makefile line or a text snippet from such a line,
 // visiting the expressions and their subexpressions.
 type MkWalker struct {
-	Diag Autofixer
 	Expr func(expr *MkExpr, time EctxTime)
 }
 
-func NewMkWalker(diag Autofixer, expr func(expr *MkExpr, time EctxTime)) *MkWalker {
-	return &MkWalker{diag, expr}
+func NewMkWalker(expr func(expr *MkExpr, time EctxTime)) *MkWalker {
+	return &MkWalker{expr}
 }
 
 // WalkLine calls the action for each variable that is used in the line.
diff --git a/v23/mkwalker_test.go b/v23/mkwalker_test.go
index 3fbd976c..c2bae462 100644
--- a/v23/mkwalker_test.go
+++ b/v23/mkwalker_test.go
@@ -10,7 +10,7 @@ func (s *Suite) Test_NewMkWalker(c *check.C) {
 		mkline.Notef("Expression \"%s\" at \"%s\" time.", expr.String(), time.String())
 	}
 
-	walker := NewMkWalker(mkline, action)
+	walker := NewMkWalker(action)
 	walker.WalkLine(mkline)
 
 	t.CheckOutputLines(
@@ -35,7 +35,7 @@ func (s *Suite) Test_MkWalker_WalkLine(c *check.C) {
 		action := func(expr *MkExpr, time EctxTime) {
 			mkline.Notef("Expression \"%s\" at \"%s\" time.", expr.String(), time.String())
 		}
-		walker := NewMkWalker(mkline, action)
+		walker := NewMkWalker(action)
 		walker.WalkLine(mkline)
 	})
 
@@ -63,7 +63,7 @@ func (s *Suite) Test_MkWalker_WalkText(c *check.C) {
 		action := func(expr *MkExpr, time EctxTime) {
 			mkline.Notef("Expression \"%s\" at \"%s\" time.", expr.String(), time.String())
 		}
-		walker := NewMkWalker(mkline, action)
+		walker := NewMkWalker(action)
 		walker.WalkLine(mkline)
 	})
 
@@ -83,7 +83,7 @@ func (s *Suite) Test_MkWalker_walkDirective(c *check.C) {
 		action := func(expr *MkExpr, time EctxTime) {
 			mkline.Notef("Expression \"%s\" at \"%s\" time.", expr.String(), time.String())
 		}
-		walker := NewMkWalker(mkline, action)
+		walker := NewMkWalker(action)
 		walker.walkDirective(mkline)
 	})
 
@@ -102,7 +102,7 @@ func (s *Suite) Test_MkWalker_walkExpr(c *check.C) {
 		action := func(expr *MkExpr, time EctxTime) {
 			mkline.Notef("Expression \"%s\" at \"%s\" time.", expr.String(), time.String())
 		}
-		walker := NewMkWalker(mkline, action)
+		walker := NewMkWalker(action)
 		walker.WalkLine(mkline)
 	})
 
@@ -125,7 +125,7 @@ func (s *Suite) Test_MkWalker_walkModifier(c *check.C) {
 		action := func(expr *MkExpr, time EctxTime) {
 			mkline.Notef("Expression \"%s\" at \"%s\" time.", expr.String(), time.String())
 		}
-		walker := NewMkWalker(mkline, action)
+		walker := NewMkWalker(action)
 		walker.WalkLine(mkline)
 	})