diff --git a/jedi/evaluate/compiled/fake/builtins.pym b/jedi/evaluate/compiled/fake/builtins.pym
index 2fc50ce1..88436fdd 100644
--- a/jedi/evaluate/compiled/fake/builtins.pym
+++ b/jedi/evaluate/compiled/fake/builtins.pym
@@ -32,9 +32,13 @@ def range(start, stop=None, step=1):
 class file():
     def __iter__(self):
         yield ''
+
     def next(self):
         return ''
 
+    def readlines(self):
+        return ['']
+
 
 class xrange():
     # Attention: this function doesn't exist in Py3k (there it is range).
diff --git a/jedi/evaluate/compiled/fake/io.pym b/jedi/evaluate/compiled/fake/io.pym
index 87b02eed..e115ea9a 100644
--- a/jedi/evaluate/compiled/fake/io.pym
+++ b/jedi/evaluate/compiled/fake/io.pym
@@ -4,3 +4,6 @@ class TextIOWrapper():
 
     def __iter__(self):
         yield str()
+
+    def readlines(self):
+        return ['']
diff --git a/test/completion/stdlib.py b/test/completion/stdlib.py
index 92b7929a..c320b3f0 100644
--- a/test/completion/stdlib.py
+++ b/test/completion/stdlib.py
@@ -65,6 +65,11 @@ class X(): pass
 #? type
 type(X)
 
+
+with open('foo') as f:
+    for line in f.readlines():
+        #? str()
+        line
 # -----------------
 # enumerate
 # -----------------