diff --git a/src/slic3r/plugin/PluginAuditManagerGui.cpp b/src/slic3r/plugin/PluginAuditManagerGui.cpp
index b50956e821..2804240a22 100644
--- a/src/slic3r/plugin/PluginAuditManagerGui.cpp
+++ b/src/slic3r/plugin/PluginAuditManagerGui.cpp
@@ -5,11 +5,14 @@
 #include "PluginManager.hpp"
 
 #include <boost/filesystem.hpp>
+#include <boost/filesystem/path.hpp>
 #include <boost/log/trivial.hpp>
 
 #include <algorithm>
+#include <cstddef>
 #include <future>
 #include <memory>
+#include <slic3r/plugin/PluginAuditManager.hpp>
 #include <string>
 #include <utility>
 #include <vector>
diff --git a/tests/slic3rutils/test_plugin_audit.cpp b/tests/slic3rutils/test_plugin_audit.cpp
index 27207f137e..fdf99ff1fc 100644
--- a/tests/slic3rutils/test_plugin_audit.cpp
+++ b/tests/slic3rutils/test_plugin_audit.cpp
@@ -3,6 +3,7 @@
 #include <boost/system/error_code.hpp>
 #include <catch2/catch_all.hpp>
 
+#include <cstddef>
 #include <libslic3r/Utils.hpp>
 #include <libslic3r/libslic3r.h>         // GCODEVIEWER_APP_KEY, SLIC3R_APP_KEY (via libslic3r_version.h)
 #include <slic3r/plugin/PluginAuditManager.hpp>