diff --git a/_pytest/assertion/rewrite.py b/_pytest/assertion/rewrite.py
index 5bf7b13cd..17157b33d 100644
--- a/_pytest/assertion/rewrite.py
+++ b/_pytest/assertion/rewrite.py
@@ -122,7 +122,7 @@ class AssertionRewritingHook(object):
                     # One of the path components was not a directory, likely
                     # because we're in a zip file.
                     write = False
-                elif e == errno.EACCES:
+                elif e in [errno.EACCES, errno.EROFS]:
                     state.trace("read only directory: %r" % fn_pypath.dirname)
                     write = False
                 else: