diff --git a/main.go b/main.go
index f37c40c0a..ce2af7899 100644
--- a/main.go
+++ b/main.go
@@ -243,6 +243,10 @@ func compile(ctx context.Context, ms *xmain.State, plugin d2plugin.Plugin, pad,
 		if err != nil {
 			return svg, false, err
 		}
+	} else {
+		if len(out) > 0  && out[len(out)-1] != '\n' {
+			out = append(out, '\n')
+		}
 	}
 
 	err = ms.WritePath(outputPath, out)