diff --git a/scico/test/linop/xray/test_xray.py b/scico/test/linop/xray/test_xray.py
index cd7c0dcd..960a9947 100644
--- a/scico/test/linop/xray/test_xray.py
+++ b/scico/test/linop/xray/test_xray.py
@@ -49,7 +49,7 @@ def test_apply():
 def test_apply_adjoint():
     im_shape = (12, 13)
     num_angles = 10
-    x = jnp.ones(im_shape)
+    x = jnp.ones(im_shape, dtype=jnp.float32)
 
     angles = jnp.linspace(0, jnp.pi, num=num_angles, endpoint=False)