diff --git a/layer2/ObjectMap.cpp b/layer2/ObjectMap.cpp
index ada826f8a..62e3457a4 100644
--- a/layer2/ObjectMap.cpp
+++ b/layer2/ObjectMap.cpp
@@ -5596,6 +5596,7 @@ static int ObjectMapNumPyArrayToMapState(PyMOLGlobals * G, ObjectMapState * ms,
   void * ptr;
 
 #ifdef _PYMOL_NUMPY
+  import_array1(0);
   PyArrayObject * pao = (PyArrayObject *) ary;
   const int itemsize = PyArray_ITEMSIZE(pao);
 #endif
diff --git a/modules/chempy/brick.py b/modules/chempy/brick.py
index fc514eb3a..e4c0f1bbb 100644
--- a/modules/chempy/brick.py
+++ b/modules/chempy/brick.py
@@ -31,7 +31,7 @@ def from_numpy(cls, data, grid, origin=(0.0, 0.0, 0.0)):
         @param range: 3f sequence
         @param origin: 3f sequence
         '''
-        data = numpy.asfarray(data)
+        data = numpy.asarray(data, dtype=numpy.float64)
         assert len(data.shape) == 3
 
         self = cls()