diff --git a/python/cudf/cudf/core/reshape.py b/python/cudf/cudf/core/reshape.py
index 8c732474b8c..cd1ce36c6c5 100644
--- a/python/cudf/cudf/core/reshape.py
+++ b/python/cudf/cudf/core/reshape.py
@@ -995,18 +995,17 @@ def unstack(df, level, fill_value=None):
             return df
     df = df.copy(deep=False)
     if not isinstance(df.index, cudf.MultiIndex):
-        if isinstance(df, cudf.DataFrame):
-            dtype = df._columns[0].dtype
-            for col in df._columns:
-                if not col.dtype == dtype:
-                    raise ValueError(
-                        "Calling unstack() on single index dataframe"
-                        " with different column datatype is not supported."
-                    )
-            res = df.T.stack(dropna=False)
-            # Result's index is a multiindex
-            res.index.names = tuple(df.columns.names) + df.index.names
-            return res
+        dtype = df._columns[0].dtype
+        for col in df._columns:
+            if not col.dtype == dtype:
+                raise ValueError(
+                    "Calling unstack() on single index dataframe"
+                    " with different column datatype is not supported."
+                )
+        res = df.T.stack(dropna=False)
+        # Result's index is a multiindex
+        res.index.names = tuple(df.columns.names) + df.index.names
+        return res
     else:
         columns = df.index._poplevels(level)
         index = df.index