diff --git a/dwm/config.def.h b/dwm/config.def.h
index 6ba495703e7b02b31d60beb313637ca1d45ad658..50a3270985ce7ff61e60407844fe622a847e6cdf 100644
--- a/dwm/config.def.h
+++ b/dwm/config.def.h
@@ -26,10 +26,10 @@ static const Rule rules[] = {
 	 *	WM_CLASS(STRING) = instance, class
 	 *	WM_NAME(STRING) = title
 	 */
-	/* class            instance    title       tags mask     isfloating   monitor */
-	{ "Gimp",           NULL,       NULL,       0,            1,           -1 },
-	{ "Firefox",        NULL,       NULL,       1 << 8,       0,           -1 },
-  { "Avizo-service",  NULL,       NULL,       0,            1,           -1 }
+	/* class            instance    title       tags mask     iscentered    isfloating   monitor */
+	{ "Gimp",           NULL,       NULL,       0,            1,            1,           -1 },
+	{ "Firefox",        NULL,       NULL,       1 << 8,       1,            0,           -1 },
+  { "Avizo-service",  NULL,       NULL,       0,            1,            1,           -1 }
 };
 
 /* layout(s) */