diff --git a/lib/galaxy/datatypes/binary.py b/lib/galaxy/datatypes/binary.py
index de47ca2548ae..9366456f593f 100644
--- a/lib/galaxy/datatypes/binary.py
+++ b/lib/galaxy/datatypes/binary.py
@@ -4331,9 +4331,7 @@ def sniff(self, filename: str) -> bool:
         try:
             npz = np.load(filename)
             if isinstance(npz, np.lib.npyio.NpzFile):
-                for f in npz.files:
-                    if isinstance(npz[f], np.ndarray):
-                        return True
+                return True
         except Exception:
             return False
         return False