diff --git a/include/meson.build b/include/meson.build
index 419437e7dc..fdeb30de04 100644
--- a/include/meson.build
+++ b/include/meson.build
@@ -1,3 +1,3 @@
 # SPDX-License-Identifier: MPL-2.0
 # Copyright (c) Yuxuan Shui <yshuiv7@gmail.com>
-subdirs('picom')
+subdir('picom')
diff --git a/include/picom/meson.build b/include/picom/meson.build
index 71727c41ad..7a22d872fa 100644
--- a/include/picom/meson.build
+++ b/include/picom/meson.build
@@ -2,7 +2,7 @@
 # Copyright (c) Yuxuan Shui <yshuiv7@gmail.com>
 
 api_headers = [
-  'api.h'
+  'api.h',
   'backend.h'
 ]
 install_headers(api_headers, subdir: 'picom')
diff --git a/meson.build b/meson.build
index 42f01427a9..c039184a18 100644
--- a/meson.build
+++ b/meson.build
@@ -107,6 +107,7 @@ test_h_dep = subproject('test.h').get_variable('test_h_dep')
 subdir('src')
 subdir('man')
 subdir('tools')
+subdir('include')
 
 install_data('bin/picom-trans', install_dir: get_option('bindir'))
 install_data('picom.desktop', install_dir: 'share/applications')