diff --git a/bazarr/libs.py b/bazarr/libs.py
index 9d734eb23..7c3a3dd9f 100644
--- a/bazarr/libs.py
+++ b/bazarr/libs.py
@@ -2,6 +2,19 @@
 
 import os
 import sys
+from shutil import rmtree
+
+
+def clean_libs():
+    libs_dir = os.path.join(os.path.dirname(os.path.dirname(__file__)), 'libs')
+
+    # Delete the old module almost empty directory compatible only with Python 2.7.x that cause bad magic number error
+    # if they are present in Python 3.x.
+    module_list = ['enum', 'concurrent']
+    for module in module_list:
+        module_path = os.path.join(libs_dir, module)
+        if os.path.isdir(module_path):
+            rmtree(module_path)
 
 
 def set_libs():
@@ -13,4 +26,5 @@ def set_libs():
         sys.path.insert(0, os.path.join(os.path.dirname(__file__), '../libs2/'))
 
 
+clean_libs()
 set_libs()