diff --git a/meson.build b/meson.build
index e92821f..23e3f28 100644
--- a/meson.build
+++ b/meson.build
@@ -351,7 +351,7 @@
     endforeach
 endif
 
-systemd_system_unit_dir = systemd.get_variable('systemdsystemunitdir')
+systemd_system_unit_dir = systemd.get_variable('systemd_system_unit_dir')
 
 bindir = get_option('prefix') + '/' + get_option('bindir')
 libexec = get_option('prefix') + '/' + get_option('libexecdir')