diff --git a/pipenv/utils.py b/pipenv/utils.py
index 2c815b6f..2b1d3b39 100644
--- a/pipenv/utils.py
+++ b/pipenv/utils.py
@@ -47,6 +47,12 @@ from contextlib import contextmanager
 from .pep508checker import lookup
 from .environments import PIPENV_MAX_ROUNDS, PIPENV_CACHE_DIR
 
+from prettytoml.elements.abstracttable import AbstractTable
+try:
+    from collections.abc import Mapping
+except ImportError:
+    from collections import Mapping
+
 if six.PY2:
 
     class ResourceWarning(Warning):
@@ -639,6 +645,8 @@ def is_star(val):
 
 
 def is_pinned(val):
+    if isinstance(val, Mapping) or isinstance(val, AbstractTable):
+        val = val.get('version')
     return isinstance(val, six.string_types) and val.startswith('==')