diff --git a/bios/meson.build b/bios/meson.build
index 8e0092a..5515e2a 100644
--- a/bios/meson.build
+++ b/bios/meson.build
@@ -23,7 +23,7 @@
 )
 
 systemd_system_unit_dir = dependency('systemd').get_variable(
-    'systemdsystemunitdir',
+    'systemd_system_unit_dir',
     pkgconfig_define: ['prefix', get_option('prefix')],
 )