diff --git a/peg.peg.go b/peg.peg.go
index fe58771..bc908f5 100644
--- a/peg.peg.go
+++ b/peg.peg.go
@@ -252,7 +252,7 @@ func (node *node32) print(w io.Writer, pretty bool, buffer string) {
 	print = func(node *node32, depth int) {
 		for node != nil {
 			for c := 0; c < depth; c++ {
-				fmt.Fprintf(w, " ")
+				fmt.Fprint(w, " ")
 			}
 			rule := rul3s[node.pegRule]
 			quote := strconv.Quote(string(([]rune(buffer)[node.begin:node.end])))
diff --git a/tree/peg.go b/tree/peg.go
index 4ab9fed..c52ecf7 100644
--- a/tree/peg.go
+++ b/tree/peg.go
@@ -71,7 +71,7 @@ func (node *node32) print(w io.Writer, pretty bool, buffer string) {
 	print = func(node *node32, depth int) {
 		for node != nil {
 			for c := 0; c < depth; c++ {
-				fmt.Fprintf(w, " ")
+				fmt.Fprint(w, " ")
 			}
 			rule := rul3s[node.pegRule]
 			quote := strconv.Quote(string(([]rune(buffer)[node.begin:node.end])))