diff --git a/src/App/AutoTransaction.h b/src/App/AutoTransaction.h
index 6f75d752b3..47ce37c4f9 100644
--- a/src/App/AutoTransaction.h
+++ b/src/App/AutoTransaction.h
@@ -23,6 +23,8 @@
 #ifndef APP_AUTOTRANSACTION_H
 #define APP_AUTOTRANSACTION_H
 
+#include <cstddef>
+
 namespace App {
 
 class Application;
@@ -31,7 +33,7 @@ class Application;
 class AppExport AutoTransaction {
 private:
     /// Private new operator to prevent heap allocation
-    void* operator new(size_t size);
+    void* operator new(std::size_t size);
 
 public:
     /** Constructor
@@ -120,7 +122,7 @@ public:
 
 private:
     /// Private new operator to prevent heap allocation
-    void* operator new(size_t size);
+    void* operator new(std::size_t size);
 
 private:
     bool active;
diff --git a/src/Gui/ViewProviderPythonFeature.h b/src/Gui/ViewProviderPythonFeature.h
index f77f53bc38..e04f737d5d 100644
--- a/src/Gui/ViewProviderPythonFeature.h
+++ b/src/Gui/ViewProviderPythonFeature.h
@@ -23,7 +23,6 @@
 #ifndef GUI_VIEWPROVIDERPYTHONFEATURE_H
 #define GUI_VIEWPROVIDERPYTHONFEATURE_H
 
-#include <App/Application.h>
 #include <App/AutoTransaction.h>
 #include <App/PropertyPythonObject.h>
 #include <App/FeaturePython.h>