diff --git a/river/Decoration.zig b/river/Decoration.zig
index 7223117..ad8920f 100644
--- a/river/Decoration.zig
+++ b/river/Decoration.zig
@@ -61,19 +61,12 @@ fn handleRequestMode(listener: ?*c.wl_listener, data: ?*c_void) callconv(.C) voi
     const wlr_xdg_toplevel: *c.wlr_xdg_toplevel = @field(wlr_xdg_surface, c.wlr_xdg_surface_union).toplevel;
     const app_id: [*:0]const u8 = if (wlr_xdg_toplevel.app_id) |id| id else "NULL";
 
-    const use_csd = for (self.server.config.csd_filter.items) |filter_app_id| {
-        if (std.mem.eql(u8, std.mem.span(app_id), filter_app_id)) break true;
-    } else false;
-
-    if (use_csd) {
-        _ = c.wlr_xdg_toplevel_decoration_v1_set_mode(
-            self.wlr_xdg_toplevel_decoration,
-            .WLR_XDG_TOPLEVEL_DECORATION_V1_MODE_CLIENT_SIDE,
-        );
-    } else {
-        _ = c.wlr_xdg_toplevel_decoration_v1_set_mode(
-            self.wlr_xdg_toplevel_decoration,
-            .WLR_XDG_TOPLEVEL_DECORATION_V1_MODE_SERVER_SIDE,
-        );
-    }
+    _ = c.wlr_xdg_toplevel_decoration_v1_set_mode(
+        self.wlr_xdg_toplevel_decoration,
+        for (self.server.config.csd_filter.items) |filter_app_id| {
+            if (std.mem.eql(u8, std.mem.span(app_id), filter_app_id)) {
+                break .WLR_XDG_TOPLEVEL_DECORATION_V1_MODE_CLIENT_SIDE;
+            }
+        } else .WLR_XDG_TOPLEVEL_DECORATION_V1_MODE_SERVER_SIDE,
+    );
 }
diff --git a/river/XdgToplevel.zig b/river/XdgToplevel.zig
index 3dfe837..945d68a 100644
--- a/river/XdgToplevel.zig
+++ b/river/XdgToplevel.zig
@@ -189,22 +189,18 @@ fn handleMap(listener: ?*c.wl_listener, data: ?*c_void) callconv(.C) void {
         }
     }
 
-    // If the toplevel has no parent and has an app_id which is not configured
-    // to use client side decorations, inform it that it is tiled. This
-    // prevents firefox, for example, from drawing shadows around itself.
-    if (wlr_xdg_toplevel.parent == null) {
-        const use_csd = for (root.server.config.csd_filter.items) |filter_app_id| {
-            if (std.mem.eql(u8, std.mem.span(app_id), filter_app_id)) break true;
-        } else false;
-
-        if (use_csd) {
+    // If the toplevel has an app_id which is not configured to use client side
+    // decorations, inform it that it is tiled.
+    for (root.server.config.csd_filter.items) |filter_app_id| {
+        if (std.mem.eql(u8, std.mem.span(app_id), filter_app_id)) {
             view.draw_borders = false;
-        } else {
-            _ = c.wlr_xdg_toplevel_set_tiled(
-                self.wlr_xdg_surface,
-                c.WLR_EDGE_LEFT | c.WLR_EDGE_RIGHT | c.WLR_EDGE_TOP | c.WLR_EDGE_BOTTOM,
-            );
+            break;
         }
+    } else {
+        _ = c.wlr_xdg_toplevel_set_tiled(
+            self.wlr_xdg_surface,
+            c.WLR_EDGE_LEFT | c.WLR_EDGE_RIGHT | c.WLR_EDGE_TOP | c.WLR_EDGE_BOTTOM,
+        );
     }
 
     view.map();