diff --git a/picamera2/allocators/dmaallocator.py b/picamera2/allocators/dmaallocator.py
index da672d02..bd73f512 100644
--- a/picamera2/allocators/dmaallocator.py
+++ b/picamera2/allocators/dmaallocator.py
@@ -95,6 +95,7 @@ def close(self):
             os.close(fd)
         self.frame_buffers = {}
         self.open_fds = []
+        self.dmaHeap.close()
 
     def __del__(self):
         self.close()
diff --git a/picamera2/dma_heap.py b/picamera2/dma_heap.py
index 3b7e1a12..3ee7380e 100644
--- a/picamera2/dma_heap.py
+++ b/picamera2/dma_heap.py
@@ -107,3 +107,6 @@ def alloc(self, name, size) -> UniqueFD:
             return UniqueFD()
 
         return allocFd
+
+    def close(self):
+        os.close(self.__dmaHeapHandle.get())