diff --git a/ethosu/vela/test/test_graph_optimiser.py b/ethosu/vela/test/test_graph_optimiser.py
index 62a1b76..4537741 100644
--- a/ethosu/vela/test/test_graph_optimiser.py
+++ b/ethosu/vela/test/test_graph_optimiser.py
@@ -32,9 +32,16 @@
     weights = create_const_tensor("weight_in", shape, np.uint8, np.zeros(shape))
     ofm = Tensor(ifm.shape, np.uint8, "test_out")
     op = testutil.create_op(Op.FullyConnected, [ifm, weights], ofm)
+
     ifm.consumer_list.append(op)
 
+    op.ifm_shapes.append([4, 1, 1, 8])
+    op.ofm_shapes.append([4, 1, 1, 8])
+
     prev_op = op.clone()
+    prev_op.ifm_shapes = op.ifm_shapes
+    prev_op.ofm_shapes = op.ofm_shapes
+
     conv_op = convert_batched_fc_shape(op, None, None)
 
     assert conv_op.ifm != prev_op.ifm
@@ -51,7 +58,13 @@
     op = testutil.create_op(Op.FullyConnected, [ifm, weights], ofm)
     ifm.consumer_list.append(op)
 
+    op.ifm_shapes.append([1, 1, 1, 8])
+    op.ofm_shapes.append([1, 1, 1, 8])
+
     prev_op = op.clone()
+    prev_op.ifm_shapes = op.ifm_shapes
+    prev_op.ofm_shapes = op.ofm_shapes
+
     conv_op = convert_batched_fc_shape(op, None, None)
 
     assert conv_op.ifm == prev_op.ifm
diff --git a/ethosu/vela/test/testutil.py b/ethosu/vela/test/testutil.py
index 9ba39bc..63f841b 100644
--- a/ethosu/vela/test/testutil.py
+++ b/ethosu/vela/test/testutil.py
@@ -69,6 +69,8 @@
     ofm = Tensor(ofm_shape, datatype, name + "_ofm")
     ofm.quantization = ofm_quant
     op.set_output_tensor(ofm)
+    op.set_ifm_ofm_shapes()
+
     return op
 
 
@@ -104,6 +106,8 @@
             qp.zero_point = np.zeros(bias_shape)
         bias = create_const_tensor("bias", bias_shape, DataType.int32, np.zeros(bias_shape), np.int32, quantization=qp)
         op.add_input_tensor(bias)
+
+    op.set_ifm_ofm_shapes()
     return op
 
 
@@ -113,6 +117,7 @@
     op.outputs = [output]
     if attrs is not None:
         op.attrs = attrs
+    op.set_ifm_ofm_shapes()
     return op