diff --git a/chempy/util/parsing.py b/chempy/util/parsing.py
index efffccc4..9a532527 100644
--- a/chempy/util/parsing.py
+++ b/chempy/util/parsing.py
@@ -379,6 +379,8 @@ def formula_to_composition(
     True
     >>> formula_to_composition('Na2CO3..7H2O') == {11: 2, 6: 1, 8: 10, 1: 14}
     True
+    >>> formula_to_composition('UO2.3') == {92: 1, 8: 2.3}
+    True
 
     """
     if prefixes is None:
diff --git a/chempy/util/tests/test_parsing.py b/chempy/util/tests/test_parsing.py
index 7819edcc..580e8079 100644
--- a/chempy/util/tests/test_parsing.py
+++ b/chempy/util/tests/test_parsing.py
@@ -752,7 +752,6 @@ def test_formula_to_html_caged(species, html):
     assert formula_to_html(species) == html
 
 
-
 def test_composition_dot_as_crystal_water_chempy08x():
     ref = {30: 1, 7: 2, 8: 12, 1: 12}
     assert formula_to_composition('Zn(NO3)2{}6H2O'.format('\u00B7')) == ref