diff --git a/Utilities/pythontools/py_spec/input/spec_namelist.py b/Utilities/pythontools/py_spec/input/spec_namelist.py
index 2e8a59b1..d40605e0 100644
--- a/Utilities/pythontools/py_spec/input/spec_namelist.py
+++ b/Utilities/pythontools/py_spec/input/spec_namelist.py
@@ -637,7 +637,7 @@ def _rectify_namelist(self):
         for key in self.boundary_keys:
             if key.lower() not in self["physicslist"].keys():
                 self["physicslist"][key] = np.zeros(
-                    [self._Mpol, self._Ntor * 2 + 1], dtype=np.float
+                    [self._Mpol, self._Ntor * 2 + 1], dtype=np.float64
                 ).tolist()
                 self["physicslist"].start_index[key.lower()] = [-self._Ntor, 0]
             else:
@@ -651,7 +651,7 @@ def _rectify_namelist(self):
         for key in self.axis_keys:
             if key.lower() not in self["physicslist"].keys():
                 self["physicslist"][key] = np.zeros(
-                    [self._Ntor + 1], dtype=np.float
+                    [self._Ntor + 1], dtype=np.float64
                 ).tolist()
                 self["physicslist"].start_index[key.lower()] = [0]
             else: