diff --git a/python/triqs_dft_tools/block_structure.py b/python/triqs_dft_tools/block_structure.py
index e5643318..3652ff6c 100644
--- a/python/triqs_dft_tools/block_structure.py
+++ b/python/triqs_dft_tools/block_structure.py
@@ -35,7 +35,7 @@
 
 
 class BlockStructure(object):
-    """ Contains information about the Green function structure.
+    r""" Contains information about the Green function structure.
 
     This class contains information about the structure of the solver
     and sumk Green functions and the mapping between them.
diff --git a/python/triqs_dft_tools/converters/wannier90.py b/python/triqs_dft_tools/converters/wannier90.py
index a48403e8..19ebdbfe 100644
--- a/python/triqs_dft_tools/converters/wannier90.py
+++ b/python/triqs_dft_tools/converters/wannier90.py
@@ -541,7 +541,7 @@ def read_wannier90_hr_data(wannier_seed):
 
 
 def read_wannier90_blochbasis_data(wannier_seed, n_wannier_spin):
-    """
+    r"""
     Method for reading the files needed in the bloch_basis: seedname_u.mat,
     seedname.eig and potentially seedname_u_dis.mat.