diff --git a/dotenv_flow.py b/dotenv_flow.py
index 3e3afa6..0a7533a 100644
--- a/dotenv_flow.py
+++ b/dotenv_flow.py
@@ -42,7 +42,8 @@ def dotenv_flow(
     if base_path is None:
         use_cwd = True
 
-    env = env not in (..., None) or os.environ.get("PY_ENV", "")
+    if env in (..., None):
+        env = os.getenv("PY_ENV", "")
 
     defaults = [".env.defaults", ".env"]
     if env not in (..., None):
diff --git a/pyproject.toml b/pyproject.toml
index 73b256d..557e283 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "dotenv-flow"
-version = "0.3.0"
+version = "0.3.1"
 description = "Like the dotenv-flow NodeJS library, for Python"
 authors = ["Carlos Gonzalez <gonsa.carlos@gmail.com>"]
 readme = "README.md"