diff --git a/dunst.c b/dunst.c
index fed36ba..d500f21 100644
--- a/dunst.c
+++ b/dunst.c
@@ -1303,7 +1303,7 @@ void setup(void)
                                                         DefaultScreen(dc->dpy)),
                           CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
         transparency = transparency > 100 ? 100 : transparency;
-	setopacity(dc, win, (unsigned long)((100 - transparency) * (0xffffffff/100)));
+        setopacity(dc, win, (unsigned long)((100 - transparency) * (0xffffffff/100)));
         grab_key(&history_ks);
 }