diff --git a/src/App/AutoTransaction.h b/src/App/AutoTransaction.h
index 6f75d752b3..c50435baf3 100644
--- a/src/App/AutoTransaction.h
+++ b/src/App/AutoTransaction.h
@@ -31,7 +31,9 @@ class Application;
 class AppExport AutoTransaction {
 private:
     /// Private new operator to prevent heap allocation
-    void* operator new(size_t size);
+    void* operator new(size_t size) {
+        return nullptr;
+    };
 
 public:
     /** Constructor
@@ -120,7 +122,9 @@ public:
 
 private:
     /// Private new operator to prevent heap allocation
-    void* operator new(size_t size);
+    void* operator new(size_t size) {
+        return nullptr;
+    };
 
 private:
     bool active;