diff --git a/nanonispy/read.py b/nanonispy/read.py
index a6c49f8..1b7a707 100644
--- a/nanonispy/read.py
+++ b/nanonispy/read.py
@@ -635,7 +635,7 @@ def _parse_sxm_header(header_raw):
         if isinstance(header_dict[key], list):
             header_dict[key] = np.asarray(header_dict[key], dtype=np.float)
         else:
-            header_dict[key] = np.float(header_dict[key])
+            header_dict[key] = float(header_dict[key])
     for key in entries_to_be_inted:
         header_dict[key] = np.asarray(header_dict[key], dtype=np.int)