diff --git a/gnpy/core/elements.py b/gnpy/core/elements.py
index 11353017c..b6e020aa8 100644
--- a/gnpy/core/elements.py
+++ b/gnpy/core/elements.py
@@ -814,7 +814,7 @@ def _gain_profile(self, pin, err_tolerance=1.0e-11, simple_opt=True):
         dgt_slope = p[0]
 
         # Calculate the target slope
-        targ_slope = self.tilt_target / (self.params.f_max - self.params.f_min)
+        targ_slope = -self.tilt_target / (self.params.f_max - self.params.f_min)
 
         # first estimate of DGT scaling
         try: