diff --git a/dotenv.py b/dotenv.py
index 3338b20..3b0b2ae 100644
--- a/dotenv.py
+++ b/dotenv.py
@@ -53,7 +53,8 @@ def read_dotenv(dotenv=None):
             for k, v in parse_dotenv(f.read()).items():
                 os.environ.setdefault(k, v)
     else:
-        warnings.warn("Not reading {0} - it doesn't exist.".format(dotenv))
+        warnings.warn("Not reading {0} - it doesn't exist.".format(dotenv),
+                      stacklevel=2)
 
 
 def parse_dotenv(content):