diff --git a/freud/box.py b/freud/box.py
index 4edbb9db3..08c711327 100644
--- a/freud/box.py
+++ b/freud/box.py
@@ -63,7 +63,9 @@ def __init__(self, Lx, Ly, Lz=0, xy=0, xz=0, yz=0, is2D=None):
         elif not (Lx and Ly and Lz):
             msg = "Lx, Ly, and Lz must be nonzero for 3D boxes."
             raise ValueError(msg)
-        self._cpp_obj = freud._box.Box(Lx, Ly, Lz, xy, xz, yz, is2D)
+        self._cpp_obj = freud._box.Box(
+            *[float(x) for x in [Lx, Ly, Lz, xy, xz, yz]], bool(is2D)
+        )
 
     @property
     def L(self):