diff --git a/src/cmd/compile/internal/typecheck/stmt.go b/src/cmd/compile/internal/typecheck/stmt.go
index 16e24a04917..60bac77d19c 100644
--- a/src/cmd/compile/internal/typecheck/stmt.go
+++ b/src/cmd/compile/internal/typecheck/stmt.go
@@ -78,7 +78,7 @@ func typecheckrangeExpr(n *ir.RangeStmt) {
 					base.ErrorfAt(n.Pos(), "cannot assign type %v to %L in range%s", t, nn, why)
 				}
 			}
-			checkassign(n, nn)
+			checkassign(nn)
 		}
 	}
 	do(n.Key, tk)
@@ -137,7 +137,7 @@ func assign(stmt ir.Node, lhs, rhs []ir.Node) {
 		if lhs[i].Typecheck() == 0 {
 			lhs[i] = AssignExpr(lhs[i])
 		}
-		checkassign(stmt, lhs[i])
+		checkassign(lhs[i])
 	}
 
 	assignType := func(i int, typ *types.Type) {
diff --git a/src/cmd/compile/internal/typecheck/typecheck.go b/src/cmd/compile/internal/typecheck/typecheck.go
index b5108eab847..85de653a82a 100644
--- a/src/cmd/compile/internal/typecheck/typecheck.go
+++ b/src/cmd/compile/internal/typecheck/typecheck.go
@@ -488,7 +488,7 @@ func typecheck1(n ir.Node, top int) ir.Node {
 	case ir.OASOP:
 		n := n.(*ir.AssignOpStmt)
 		n.X, n.Y = Expr(n.X), Expr(n.Y)
-		checkassign(n, n.X)
+		checkassign(n.X)
 		if n.IncDec && !okforarith[n.X.Type().Kind()] {
 			base.Errorf("invalid operation: %v (non-numeric type %v)", n, n.X.Type())
 			return n
@@ -1562,7 +1562,7 @@ func checklvalue(n ir.Node, verb string) {
 	}
 }
 
-func checkassign(stmt ir.Node, n ir.Node) {
+func checkassign(n ir.Node) {
 	// have already complained about n being invalid
 	if n.Type() == nil {
 		if base.Errors() == 0 {