diff --git a/concrete/numpy/tracing.py b/concrete/numpy/tracing.py
index 99023884c..8c3a66e46 100644
--- a/concrete/numpy/tracing.py
+++ b/concrete/numpy/tracing.py
@@ -265,8 +265,8 @@ class NPTracer(BaseTracer):
         # numpy.remainder,
         # numpy.right_shift,
         numpy.rint,
-        # numpy.sign,
-        # numpy.signbit,
+        numpy.sign,
+        numpy.signbit,
         numpy.sin,
         numpy.sinh,
         numpy.spacing,