diff --git a/hysop/operator/tests/test_custom.py b/hysop/operator/tests/test_custom.py
index 31263a3ec18417ab9cf095c96d0fca5852f40144..c357d335a5e94f35708f317a0053712e0e08e68e 100644
--- a/hysop/operator/tests/test_custom.py
+++ b/hysop/operator/tests/test_custom.py
@@ -44,8 +44,8 @@ class TestCustom(object):
         for _ in range(1, 6):
             data[...] += (x**2)*npw.sin(y)*npw.exp(z*_)
 
-   @staticmethod
-   def __analytic_python(F):
+    @staticmethod
+    def __analytic_python(F):
         TestCustom.__analytic_init(F.data[0], F.compute_mesh_coords, 0)
 
     __analytic_opencl = """