diff --git a/python/test/unit/language/test_core.py b/python/test/unit/language/test_core.py
index 186aaf962..9b037165f 100644
--- a/python/test/unit/language/test_core.py
+++ b/python/test/unit/language/test_core.py
@@ -740,8 +740,6 @@ def test_cast(dtype_x, dtype_z, bitcast, device='cuda'):
         x = np.array([x0], dtype=getattr(np, dtype_x))
         x_tri = to_triton(x)
 
-    SIZE = 1024
-    x = triton.testing.random((SIZE, ), dtype=cvt[dtype_x], device=device)
     # triton kernel
     @triton.jit
     def kernel(X, Z, BITCAST: tl.constexpr):