diff --git a/miext/sync/meson.build b/miext/sync/meson.build
index 0892fd807..431032711 100644
--- a/miext/sync/meson.build
+++ b/miext/sync/meson.build
@@ -10,7 +10,7 @@ hdrs_miext_sync = [
     'misyncstr.h',
 ]
 
-if build_dri3 or build_xwayland
+if build_dri3 or build_xwayland or xshmfence_dep.found()
     srcs_miext_sync += 'misyncshm.c'
 endif