diff --git a/errors.go b/errors.go
index 6a79e7f..fbaab82 100644
--- a/errors.go
+++ b/errors.go
@@ -8,7 +8,10 @@ import (
 	"strings"
 )
 
-var _ error = (*errorWithStack)(nil)
+var (
+	_ error        = (*errorWithStack)(nil)
+	_ fmt.Stringer = (stackTraces)(nil)
+)
 
 // MaxStackDepth is the maximum depth of the stack trace.
 var MaxStackDepth = 50
@@ -105,10 +108,13 @@ type Frame struct {
 
 func (traces stackTraces) String() string {
 	var sb strings.Builder
-	for _, errws := range traces {
-		sb.WriteString(fmt.Sprintf("%s\n", errws.Error()))
+	for i, errws := range traces {
+		if i > 0 {
+			sb.WriteString("\n")
+		}
+		sb.WriteString(errws.Error())
 		for _, frame := range errws.Frames {
-			sb.WriteString(fmt.Sprintf("%s\n\t%s:%d\n", frame.Name, frame.File, frame.Line))
+			sb.WriteString(fmt.Sprintf("\n%s\n\t%s:%d", frame.Name, frame.File, frame.Line))
 		}
 	}
 	return sb.String()
diff --git a/errors_test.go b/errors_test.go
index 10b0fa0..c62dd3a 100644
--- a/errors_test.go
+++ b/errors_test.go
@@ -206,13 +206,16 @@ func TestJSON(t *testing.T) {
 func TestString(t *testing.T) {
 	err := l()
 	s := errors.StackTraces(err).String()
-	t.Log(s)
 	if !strings.Contains(s, "error a\n") {
 		t.Error(`"error a\n\t" not found`)
 	}
 	if !strings.Contains(s, ".a\n\t") {
 		t.Error(`".a\n\t" not found`)
 	}
+	if strings.HasSuffix(s, "\n") {
+		t.Error(`"\n" found`)
+	}
+	t.Log(s)
 }
 
 func TestSlogJSON(t *testing.T) {