diff --git a/gunicorn/config.py b/gunicorn/config.py
index 0e689d2e8..67d9116de 100644
--- a/gunicorn/config.py
+++ b/gunicorn/config.py
@@ -167,7 +167,7 @@ def env(self):
         for e in raw_env:
             s = six.bytes_to_str(e)
             try:
-                k, v = s.split('=')
+                k, v = s.split('=', 1)
             except ValueError:
                 raise RuntimeError("environement setting %r invalid" % s)