diff --git a/pw_log_null/BUILD.gn b/pw_log_null/BUILD.gn
index f4b546a..ff5ddcb 100644
--- a/pw_log_null/BUILD.gn
+++ b/pw_log_null/BUILD.gn
@@ -31,6 +31,11 @@
   public = [ "public_overrides/pw_log_backend/log_backend.h" ]
   sources = [ "public/pw_log_null/log_null.h" ]
   friend = [ ":*" ]
+  public_deps = [ dir_pw_preprocessor ]
+}
+
+pw_source_set("pw_log_null.impl") {
+  sources = []
 }
 
 pw_doc_group("docs") {