diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index ec24c23..a4490b8 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -13,6 +13,7 @@ Changelog
 **Bug fix**
 
 - Fixed a bug in the construction of nullable arrays using :func:`ndonnx.asarray` where the shape of the null field would not match the values field if the provided `np.ma.MaskedArray`'s mask was scalar.
+- Fixed a bug in the implementation of :func:`ndonnx.ones_like` for arrays without a concrete shape.
 
 
 0.9.0 (2024-08-30)
diff --git a/ndonnx/_core/_shapeimpl.py b/ndonnx/_core/_shapeimpl.py
index 4e90232..56a3c8d 100644
--- a/ndonnx/_core/_shapeimpl.py
+++ b/ndonnx/_core/_shapeimpl.py
@@ -252,7 +252,7 @@ def zeros_like(self, x, dtype=None, device=None):
         return ndx.zeros(nda.shape(x), dtype=dtype or x.dtype, device=device)
 
     def ones_like(self, x, dtype=None, device=None):
-        return ndx.ones(x.shape, dtype=dtype or x.dtype, device=device)
+        return ndx.ones(nda.shape(x), dtype=dtype or x.dtype, device=device)
 
     def make_array(
         self,
diff --git a/tests/test_core.py b/tests/test_core.py
index b0eaae3..5063954 100644
--- a/tests/test_core.py
+++ b/tests/test_core.py
@@ -500,6 +500,16 @@ def test_creation_full():
     )
 
 
+def test_creation_ones_like():
+    a = ndx.array(shape=("N",), dtype=ndx.int64)
+    b = ndx.ones_like(a)
+    model = ndx.build({"a": a}, {"b": b})
+    assert_array_equal(
+        run(model, {"a": np.array([1, 2, 3], dtype=np.int64)})["b"],
+        np.ones(3, dtype=np.int64),
+    )
+
+
 @pytest.mark.parametrize(
     "args, expected",
     [