diff --git a/bar/CMakeLists.txt b/bar/CMakeLists.txt
index f0e6ffa..e57442b 100644
--- a/bar/CMakeLists.txt
+++ b/bar/CMakeLists.txt
@@ -35,6 +35,7 @@ if (ENABLE_WAYLAND)
     set(${_deps} ${deps} PARENT_SCOPE)
   endfunction ()
 
+  pkg_check_modules(WAYLAND_PROTOCOLS REQUIRED wayland-protocols)
   execute_process(
     COMMAND ${PKG_CONFIG_EXECUTABLE} --variable=pkgdatadir wayland-protocols
     OUTPUT_VARIABLE WAYLAND_PROTOCOLS