diff --git a/src/calibre/utils/shm.py b/src/calibre/utils/shm.py
index abb083c75a..6857b18a44 100644
--- a/src/calibre/utils/shm.py
+++ b/src/calibre/utils/shm.py
@@ -132,6 +132,15 @@ class SharedMemory:
 
         self._size = size
 
+    @property
+    def memory_address(self) -> int:
+        import ctypes
+        obj = ctypes.py_object(self.mmap)
+        address = ctypes.c_void_p()
+        length = ctypes.c_ssize_t()
+        ctypes.pythonapi.PyObject_AsReadBuffer(obj, ctypes.byref(address), ctypes.byref(length))
+        return address.value
+
     def read(self, sz: int = 0) -> bytes:
         if sz <= 0:
             sz = self.size