diff --git a/apps/api/src/api/terminal.py b/apps/api/src/api/terminal.py
index c43ed91..99187a1 100644
--- a/apps/api/src/api/terminal.py
+++ b/apps/api/src/api/terminal.py
@@ -100,6 +100,12 @@ async def terminal_websocket(
         # Cancel remaining tasks
         for task in pending:
             task.cancel()
+        
+        # Close WebSocket cleanly to avoid 1006 abnormal closure
+        try:
+            await websocket.close(code=1000)
+        except Exception:
+            pass
 
     except Exception as exc:
         logger.error("Terminal session error for instance %s: %s", instance_id, str(exc), exc_info=True)