diff --git a/process/solver.py b/process/solver.py
index 31551f5398..046d03c97a 100644
--- a/process/solver.py
+++ b/process/solver.py
@@ -169,7 +169,9 @@ def solve(self) -> int:
         if self.b is not None:
             B = np.identity(numerics.nvar) * self.b
 
-        def _solver_callback(i: int, _x, _result, convergence_param: float):
+        def _solver_callback(i: int, _result, _x, convergence_param: float):
+            numerics.nviter = i + 1
+            global_variables.convergence_parameter = convergence_param
             print(
                 f"{i+1} | Convergence Parameter: {convergence_param:.3E}",
                 end="\r",
diff --git a/tests/regression/scenario.py b/tests/regression/scenario.py
index 630231064e..9c4971f7f8 100644
--- a/tests/regression/scenario.py
+++ b/tests/regression/scenario.py
@@ -1,4 +1,5 @@
 """Scenario class for an individual regression test case."""
+
 import logging
 import sys
 import os
@@ -31,6 +32,7 @@
     "sig_tf_r_max(1)",
     "sqsumsq",
     "ric(nohc)",
+    "nviter",
 }
 EXCLUSION_PATTERNS = [
     r"normres\d{3}",  # normres and 3 digits