diff --git a/src/ParsingDriver.cc b/src/ParsingDriver.cc
index b2c93f297738d4cfd1db4f68ae19b834b7d0a14b..8c15fd66661c6dd4a5ba8702505d013211689a05 100644
--- a/src/ParsingDriver.cc
+++ b/src/ParsingDriver.cc
@@ -3232,6 +3232,7 @@ ParsingDriver::end_irf_calibration()
                                                      mod_file->symbol_table,
                                                      options_list));
   irf_calibration_constraints.clear();
+  options_list.clear();
 }
 
 void