diff --git a/glib/meson.build b/glib/meson.build
index b2dd569e1..b013991a1 100644
--- a/glib/meson.build
+++ b/glib/meson.build
@@ -541,7 +540,7 @@ configure_file(
   input: 'libglib-gdb.py.in',
   output: 'libglib-2.0.so.@0@-gdb.py'.format(library_version),
   configuration: gdb_conf,
-  install_dir: gdb_install_dir,
+  install_dir: glib_libdir,
   install_tag: 'devel',
   install: gdb_install,
 )
diff --git a/gobject/meson.build b/gobject/meson.build
@@ -185,7 +184,7 @@ configure_file(
   input: 'libgobject-gdb.py.in',
   output: 'libgobject-2.0.so.@0@-gdb.py'.format(library_version),
   configuration: gdb_conf,
-  install_dir: gdb_install_dir,
+  install_dir: glib_libdir,
   install_tag: 'devel',
   install: gdb_install,
 )