--- a/liboctave/oct-alloc.h
+++ b/liboctave/oct-alloc.h
@@ -64,7 +64,7 @@
     void *operator new (size_t size, void *p) \
       { return ::operator new (size, p); } \
     void operator delete (void *p, void *) \
-      { return ::operator delete (p); } \
+      { ::operator delete (p); } \
     void *operator new (size_t size) { return allocator.alloc (size); } \
     void operator delete (void *p, size_t size) { allocator.free (p, size); } \
   private: \

--- a/src/oct-obj.h
+++ b/src/oct-obj.h
@@ -66,7 +66,7 @@
     { return ::operator new (size, p); }
 
   void operator delete (void *p, void *)
-    { return ::operator delete (p, static_cast<void *> (0)); }
+    { ::operator delete (p, static_cast<void *> (0)); }
 
   octave_value_list& operator = (const octave_value_list& obj)
     {