diff --git a/arkane/encorr/isodesmic.py b/arkane/encorr/isodesmic.py
index 0415489ee8b..ebb4c287ed5 100644
--- a/arkane/encorr/isodesmic.py
+++ b/arkane/encorr/isodesmic.py
@@ -729,7 +729,7 @@ def _find_error_canceling_reaction(self, reference_subset, milp_software=None):
                 # Reset signal handling since lpsolve changed it
                 try:
                     signal.signal(signal.SIGINT, sig)
-                except ValueError:
+                except TypeError:
                     # This is not being run in the main thread, so we cannot reset signal
                     pass