diff --git a/brotab/parallel.py b/brotab/parallel.py
index 4167817..7df77e5 100644
--- a/brotab/parallel.py
+++ b/brotab/parallel.py
@@ -1,6 +1,5 @@
 from concurrent.futures import ThreadPoolExecutor
-from asyncio import get_event_loop, gather
-
+from asyncio import get_event_loop, gather, new_event_loop, set_event_loop
 
 def call_parallel(functions):
     """
@@ -9,7 +8,15 @@ def call_parallel(functions):
     Create a pool of thread as large as the number of functions.
     Functions should accept no parameters (wrap then with partial or lambda).
     """
-    loop = get_event_loop()
+
+    try:
+      loop = get_event_loop()
+      if loop.is_closed():
+        raise RuntimeError("Event loop is closed.")
+    except RuntimeError:
+      loop = new_event_loop()
+      set_event_loop(loop)
+
     executor = ThreadPoolExecutor(max_workers=len(functions))
 
     try: