diff --git a/SimPEG/Mesh/BaseMesh.py b/SimPEG/Mesh/BaseMesh.py
index 2d70093c..10956dbf 100644
--- a/SimPEG/Mesh/BaseMesh.py
+++ b/SimPEG/Mesh/BaseMesh.py
@@ -26,7 +26,7 @@ class BaseMesh(object):
 
         # Ensure x0 & n are 1D vectors
         self._n = np.array(n, dtype=int).ravel()
-        self._x0 = np.array(x0).ravel()
+        self._x0 = np.array(x0, dtype=float).ravel()
 
     @property
     def x0(self):