diff --git a/printer/printer.go b/printer/printer.go
index f1a40e1..0c8a7f2 100644
--- a/printer/printer.go
+++ b/printer/printer.go
@@ -553,8 +553,15 @@ func (p *Printer) printScalarEncapsedStringPart(n node.Node) {
 func (p *Printer) printScalarEncapsed(n node.Node) {
 	io.WriteString(p.w, "\"")
 
-	for _, nn := range n.(*scalar.Encapsed).Parts {
-		p.Print(nn)
+	for _, part := range n.(*scalar.Encapsed).Parts {
+		switch part.(type) {
+		case *scalar.EncapsedStringPart:
+			p.Print(part)
+		default:
+			io.WriteString(p.w, "{")
+			p.Print(part)
+			io.WriteString(p.w, "}")
+		}
 	}
 
 	io.WriteString(p.w, "\"")
@@ -567,8 +574,15 @@ func (p *Printer) printScalarHeredoc(n node.Node) {
 	io.WriteString(p.w, nn.Label)
 	io.WriteString(p.w, "\n")
 
-	for _, nn := range nn.Parts {
-		p.Print(nn)
+	for _, part := range nn.Parts {
+		switch part.(type) {
+		case *scalar.EncapsedStringPart:
+			p.Print(part)
+		default:
+			io.WriteString(p.w, "{")
+			p.Print(part)
+			io.WriteString(p.w, "}")
+		}
 	}
 
 	io.WriteString(p.w, strings.Trim(nn.Label, "\"'"))
@@ -1232,7 +1246,14 @@ func (p *Printer) printExprShellExec(n node.Node) {
 
 	io.WriteString(p.w, "`")
 	for _, part := range nn.Parts {
-		p.Print(part)
+		switch part.(type) {
+		case *scalar.EncapsedStringPart:
+			p.Print(part)
+		default:
+			io.WriteString(p.w, "{")
+			p.Print(part)
+			io.WriteString(p.w, "}")
+		}
 	}
 	io.WriteString(p.w, "`")
 }
diff --git a/printer/printer_test.go b/printer/printer_test.go
index e99f2bc..900dadb 100644
--- a/printer/printer_test.go
+++ b/printer/printer_test.go
@@ -346,7 +346,7 @@ func TestPrintScalarEncapsed(t *testing.T) {
 		},
 	})
 
-	if o.String() != `"hello $var world"` {
+	if o.String() != `"hello {$var} world"` {
 		t.Errorf("TestPrintScalarEncapsed is failed\n")
 	}
 }
@@ -365,7 +365,7 @@ func TestPrintScalarHeredoc(t *testing.T) {
 	})
 
 	expected := `<<<LBL
-hello $var world
+hello {$var} world
 LBL`
 	actual := o.String()
 
@@ -1844,7 +1844,7 @@ func TestPrintShellExec(t *testing.T) {
 		},
 	})
 
-	expected := "`hello $world!`"
+	expected := "`hello {$world}!`"
 	actual := o.String()
 
 	if expected != actual {