diff --git a/src/meson.build b/src/meson.build
index ab786c0..5f5c78b 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -56,6 +56,7 @@
   'signal.cpp',
   'str/cat.cpp',
   'str/cexpr.cpp',
+  'str/maps.cpp',
   'util/cexec.cpp',
   'zstring.cpp',
   'zstring_view.cpp',