diff --git a/bar/meson.build b/bar/meson.build
index 27f6162..781c8e8 100644
--- a/bar/meson.build
+++ b/bar/meson.build
@@ -14,28 +14,29 @@ if backend_wayland
   wscanner_prog = find_program(
     wscanner.get_pkgconfig_variable('wayland_scanner'), native: true)
 
-  wayland_protocol_header = generator(
-    wscanner_prog,
-    output: '@BASENAME@.h',
-    arguments: ['client-header', '@INPUT@', '@OUTPUT@'])
-  wayland_protocol_source = generator(
-    wscanner_prog,
-    output: '@BASENAME@.c',
-    arguments: ['private-code', '@INPUT@', '@OUTPUT@'])
-
+  wl_proto_headers = []
+  wl_proto_src = []
   generated_wayland_protocols = []
   foreach prot : [
     '../external/wlr-layer-shell-unstable-v1.xml',
     wayland_protocols_datadir + '/stable/xdg-shell/xdg-shell.xml',
     wayland_protocols_datadir + '/unstable/xdg-output/xdg-output-unstable-v1.xml']
 
-    generated_wayland_protocols += [
-      wayland_protocol_header.process(prot),
-      wayland_protocol_source.process(prot)]
+    wl_proto_headers += custom_target(
+      prot.underscorify() + '-client-header',
+      output : '@BASENAME@.h',
+      input : prot,
+      command : [wscanner_prog, 'client-header', '@INPUT@', '@OUTPUT@'])
+
+    wl_proto_src += custom_target(
+      prot.underscorify() + '-private-code',
+      output : '@BASENAME@.c',
+      input : prot,
+      command : [wscanner_prog, 'private-code', '@INPUT@', '@OUTPUT@'])
   endforeach
 
   bar_wayland = declare_dependency(
-    sources: ['wayland.c', 'wayland.h'] + generated_wayland_protocols,
+    sources: ['wayland.c', 'wayland.h'] + wl_proto_src + wl_proto_headers,
     dependencies: [wayland_client, wayland_cursor, cairo, cairo_ft])
 
   bar_backends += [bar_wayland]