diff --git a/pint_pandas/pint_array.py b/pint_pandas/pint_array.py
index 93c787e..aa40b2f 100644
--- a/pint_pandas/pint_array.py
+++ b/pint_pandas/pint_array.py
@@ -42,7 +42,7 @@ class PintType(ExtensionDtype):
     """
 
     type = _Quantity
-    # kind = 'O'
+    kind = "O"
     # str = '|O08'
     # base = np.dtype('O')
     # num = 102
diff --git a/pint_pandas/testsuite/test_issues.py b/pint_pandas/testsuite/test_issues.py
index 74f26eb..a4d2457 100644
--- a/pint_pandas/testsuite/test_issues.py
+++ b/pint_pandas/testsuite/test_issues.py
@@ -311,3 +311,14 @@ def test_issue246(self):
 
         # now an operation where each cell is independent from each other
         df.apply(lambda x: x * 2, axis=1)
+
+
+def TestIssue245(BaseExtensionTests):
+    def test_issue245(self):
+        km = pd.Series([1.0, 2.0, np.nan], dtype="pint[km]")
+        kg = pd.Series([1.0, 2.0, np.nan], dtype="pint[kg]")
+
+        xx = pd.DataFrame({"a": km, "b": km})
+        yy = pd.DataFrame({"a": kg, "b": kg})
+
+        pd.concat([xx, yy], axis=0)