diff --git a/openmc/opencg_compatible.py b/openmc/opencg_compatible.py
index a6f90818f9..1cdf8e8756 100644
--- a/openmc/opencg_compatible.py
+++ b/openmc/opencg_compatible.py
@@ -220,7 +220,7 @@ def get_opencg_surface(openmc_surface):
         opencg_surface = opencg.Plane(surface_id, name, boundary, A, B, C, D)
 
     elif openmc_surface.type == 'x-plane':
-        x0 = openmc_surface.y0
+        x0 = openmc_surface.x0
         opencg_surface = opencg.XPlane(surface_id, name, boundary, x0)
 
     elif openmc_surface.type == 'y-plane':
diff --git a/openmc/surface.py b/openmc/surface.py
index 164bbd09bf..063787ce34 100644
--- a/openmc/surface.py
+++ b/openmc/surface.py
@@ -275,7 +275,7 @@ class XPlane(Plane):
 
     @property
     def x0(self):
-        return self.coeff['x0']
+        return self.coeffs['x0']
 
     @x0.setter
     def x0(self, x0):