diff --git a/tinygrad/runtime/ops_nv.py b/tinygrad/runtime/ops_nv.py
index eb48caf39b..b04f804158 100644
--- a/tinygrad/runtime/ops_nv.py
+++ b/tinygrad/runtime/ops_nv.py
@@ -86,7 +86,9 @@ class NVCompiler(Compiler):
 class HWQueue:
   def __init__(self): self.q, self.binded_device, self.next_cmd_index = [], None, 0
   def __del__(self):
-    if self.binded_device is not None: self.binded_device._gpu_free(self.hw_page)
+    if self.binded_device is not None:
+      self.binded_device.synchronize() # Synchronize to ensure the buffer is no longer in use.
+      self.binded_device._gpu_free(self.hw_page)
 
   def ptr(self) -> int: return self.next_cmd_index