diff --git a/doc/nitpick-exceptions.txt b/doc/nitpick-exceptions.txt
index 0c98292aad5862130860f289baf13650f36453f9..3544621b7deae1d2014c31a8fd6953ed5f81c120 100644
--- a/doc/nitpick-exceptions.txt
+++ b/doc/nitpick-exceptions.txt
@@ -18,6 +18,7 @@ cpp:type bob::io::base::HDF5File
 # exceptions are not found in python 2.7
 py:exc RuntimeError
 py:class tuple
+c:func PyUnicode_FSConverter
 
 # these don't exists on numpy's manual
 py:class numpy.uint8