diff --git a/src/cmd/internal/gc/gsubr.go b/src/cmd/internal/gc/gsubr.go
index cee5099e3ae..e86d2ab3e4d 100644
--- a/src/cmd/internal/gc/gsubr.go
+++ b/src/cmd/internal/gc/gsubr.go
@@ -208,7 +208,7 @@ func ggloblnod(nam *Node) {
 	p.To.Sym = nil
 	p.To.Type = obj.TYPE_CONST
 	p.To.Offset = nam.Type.Width
-	if nam.Readonly != 0 {
+	if nam.Readonly {
 		p.From3.Offset = obj.RODATA
 	}
 	if nam.Type != nil && !haspointers(nam.Type) {
diff --git a/src/cmd/internal/gc/sinit.go b/src/cmd/internal/gc/sinit.go
index 12562231fcc..c5e006b160f 100644
--- a/src/cmd/internal/gc/sinit.go
+++ b/src/cmd/internal/gc/sinit.go
@@ -521,7 +521,7 @@ func staticname(t *Type, ctxt int) *Node {
 	statuniqgen++
 	n := newname(Lookup(namebuf))
 	if ctxt == 0 {
-		n.Readonly = 1
+		n.Readonly = true
 	}
 	addvar(n, t, PEXTERN)
 	return n
diff --git a/src/cmd/internal/gc/syntax.go b/src/cmd/internal/gc/syntax.go
index 9b2f9aeaef8..f209afd41fc 100644
--- a/src/cmd/internal/gc/syntax.go
+++ b/src/cmd/internal/gc/syntax.go
@@ -45,7 +45,7 @@ type Node struct {
 	Initorder      uint8
 	Used           uint8
 	Isddd          uint8
-	Readonly       uint8
+	Readonly       bool
 	Implicit       uint8
 	Addrtaken      uint8 // address taken, even if not moved to heap
 	Assigned       uint8 // is the variable ever assigned to