diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 3d351a7c..726f0045 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -33,6 +33,7 @@ repos:
         - F # pyflakes
         - B # flake8-bugbear
         - I # isort
+        - NPY # numpy-specific rules
 
   - repo: https://github.com/neutrinoceros/inifix
     rev: v5.0.2
diff --git a/pytools/idfx_io.py b/pytools/idfx_io.py
index 480e713d..17dc6272 100644
--- a/pytools/idfx_io.py
+++ b/pytools/idfx_io.py
@@ -29,7 +29,7 @@ def __init__(self, fh, byteorder="little"):
         dims = []
         for dim in range(self.ndims):
             dims.append(int.from_bytes(fh.read(INT_SIZE), byteorder))
-        ntot = int(np.product(dims))
+        ntot = int(np.prod(dims))
         raw = struct.unpack(str(ntot) + "d", fh.read(DOUBLE_SIZE * ntot))
         self.array = np.asarray(raw).reshape(dims[::-1])