diff --git a/qga/meson.build b/qga/meson.build
index 619ff095bc..65c1e93846 100644
--- a/qga/meson.build
+++ b/qga/meson.build
@@ -125,7 +125,7 @@ if targetos == 'windows'
                               wixl, '-o', '@OUTPUT0@', '@INPUT0@',
                               qemu_ga_msi_arch[cpu],
                               qemu_ga_msi_vss,
-                              '-D', 'BUILD_DIR=' + meson.build_root(),
+                              '-D', 'BUILD_DIR=' + meson.project_build_root(),
                               '-D', 'BIN_DIR=' + glib.get_variable('bindir'),
                               '-D', 'QEMU_GA_VERSION=' + config_host['QEMU_GA_VERSION'],
                               '-D', 'QEMU_GA_MANUFACTURER=' + config_host['QEMU_GA_MANUFACTURER'],