diff --git a/model_server/process.py b/model_server/process.py
index 2bc094225c77c3ab0972c43bc7de0832c66d7fad..767cd1f66af5f8489cda8492107eb029f1f65e03 100644
--- a/model_server/process.py
+++ b/model_server/process.py
@@ -14,8 +14,6 @@ def pad(yxcz, mpx: int):
     :return: np.ndarray array of size (mpx, mpx, nc, nz)
     """
     assert len(yxcz.shape) == 4
-    nc = yxcz.shape[2]
-    nz = yxcz.shape[3]
     dh = 0.5 * (mpx - yxcz.shape[0])
     dw = 0.5 * (mpx - yxcz.shape[1])