diff --git a/chempy/chemistry.py b/chempy/chemistry.py
index f20f75bb..0543f0e2 100644
--- a/chempy/chemistry.py
+++ b/chempy/chemistry.py
@@ -574,7 +574,7 @@ def check_all_integral(self, throw=False):
             for nam in "reac prod inact_reac inact_prod".split()
         ]:
             for k, v in cont.items():
-                if v != type(v)(int(v)):
+                if v != int(v) and v != type(v)(int(v)):
                     if throw:
                         raise ValueError(
                             "Found a non-integer stoichiometric coefficient for %s in %s."