diff --git a/pipreqs/pipreqs.py b/pipreqs/pipreqs.py
index 02b735b..2d2b922 100755
--- a/pipreqs/pipreqs.py
+++ b/pipreqs/pipreqs.py
@@ -49,7 +49,7 @@ def get_all_imports(path, encoding=None, extra_ignore_dirs=None):
     raw_imports = set()
     candidates = []
     ignore_errors = False
-    ignore_dirs = [".hg", ".svn", ".git", "__pycache__", "env", "venv"]
+    ignore_dirs = [".hg", ".svn", ".git", ".tox", "__pycache__", "env", "venv"]
 
     if extra_ignore_dirs:
         ignore_dirs_parsed = []