diff --git a/src/sage/rings/power_series_ring.py b/src/sage/rings/power_series_ring.py
index 33e1cfa5e87..bcc7b3bdc7e 100644
--- a/src/sage/rings/power_series_ring.py
+++ b/src/sage/rings/power_series_ring.py
@@ -154,6 +154,7 @@
 from sage.structure.parent import Parent
 from sage.structure.nonexact import Nonexact
 from sage.structure.unique_representation import UniqueRepresentation
+from sage.rings.laurent_series_ring import LaurentSeriesRing
 
 _CommutativeRings = commutative_rings.CommutativeRings()
 import sage.categories.integral_domains as integral_domains
@@ -171,8 +172,8 @@
     from .laurent_series_ring import LaurentSeriesRing
     from .laurent_series_ring_element import LaurentSeries
 except ImportError:
-    LaurentSeriesRing = ()
-    LaurentSeries = ()
+    from sage.rings.laurent_series_ring import LaurentSeriesRing
+    from sage.rings.laurent_series_ring_element import LaurentSeries
 
 lazy_import('sage.rings.lazy_series_ring', 'LazyPowerSeriesRing')
 
@@ -602,6 +603,24 @@ def __init__(self, base_ring, name=None, default_prec=None, sparse=False,
         else:
             self.__generator = self.element_class(self, R.gen(), is_gen=True)
 
+    def _pseudo_fraction_field(self):
+        """
+        Return the pseudo-fraction field of this power series ring.
+
+        This is the Laurent series ring over the same base ring with the same
+        variable name, where division is defined.
+
+        EXAMPLES::
+            sage: R.<x> = PowerSeriesRing(QQ)
+            sage: R._pseudo_fraction_field()
+            Laurent Series Ring in x over Rational Field
+            sage: K.<z> = PowerSeriesRing(QQ)
+            sage: R.<x> = PowerSeriesRing(K)
+            sage: R._pseudo_fraction_field()
+            Laurent Series Ring in x over Power Series Ring in z over Rational Field
+        """
+        return LaurentSeriesRing(self.base_ring(), self._names[0])
+
     def variable_names_recursive(self, depth=None):
         r"""
         Return the list of variable names of this and its base rings.
@@ -1422,7 +1441,6 @@ def fraction_field(self):
         """
         return self.laurent_series_ring()
 
-
 def unpickle_power_series_ring_v0(base_ring, name, default_prec, sparse):
     """
     Unpickle (deserialize) a univariate power series ring according to