diff --git a/rlz/BUILD.gn b/rlz/BUILD.gn
index cf56eb53277768..fee26a7f3ca407 100644
--- a/rlz/BUILD.gn
+++ b/rlz/BUILD.gn
@@ -49,8 +49,6 @@ if (!is_android) {
       "lib/financial_ping.h",
       "lib/machine_id.cc",
       "lib/machine_id.h",
-      "lib/recursive_cross_process_lock_posix.cc",
-      "lib/recursive_cross_process_lock_posix.h",
       "lib/rlz_lib.cc",
       "lib/rlz_lib.h",
       "lib/rlz_lib_clear.cc",
@@ -85,6 +83,12 @@ if (!is_android) {
       "//url",
     ]
 
+    if (is_posix) {
+      sources += [
+        "lib/recursive_cross_process_lock_posix.cc",
+        "lib/recursive_cross_process_lock_posix.h",
+      ]
+    }
     if (is_chromeos) {
       deps += [ "//chromeos" ]
     }