diff --git a/src/presolve/HPresolve.cpp b/src/presolve/HPresolve.cpp
index dbb7854d94..6c72a06046 100644
--- a/src/presolve/HPresolve.cpp
+++ b/src/presolve/HPresolve.cpp
@@ -6307,8 +6307,7 @@ void HPresolve::debug(const HighsLp& lp, const HighsOptions& options) {
 
     sol = reducedsol;
     basis = reducedbasis;
-    postsolve_stack.undoUntil(options, flagRow, flagCol, sol, basis,
-                              tmp.numReductions());
+    postsolve_stack.undoUntil(options, sol, basis, tmp.numReductions());
 
     HighsBasis temp_basis;
     HighsSolution temp_sol;
@@ -6354,8 +6353,7 @@ void HPresolve::debug(const HighsLp& lp, const HighsOptions& options) {
                          ARstart, ARindex, ARvalue);
     sol = reducedsol;
     basis = reducedbasis;
-    postsolve_stack.undoUntil(options, flagRow, flagCol, sol, basis,
-                              reductionLim);
+    postsolve_stack.undoUntil(options, sol, basis, reductionLim);
 
     calculateRowValuesQuad(model, sol);
     kktinfo = dev_kkt_check::initInfo();
diff --git a/src/presolve/HighsPostsolveStack.h b/src/presolve/HighsPostsolveStack.h
index bb1b1f785b..e324af710b 100644
--- a/src/presolve/HighsPostsolveStack.h
+++ b/src/presolve/HighsPostsolveStack.h
@@ -784,9 +784,7 @@ class HighsPostsolveStack {
   */
 
   // Only used for debugging
-  void undoUntil(const HighsOptions& options,
-                 const std::vector<HighsInt>& flagRow,
-                 const std::vector<HighsInt>& flagCol, HighsSolution& solution,
+  void undoUntil(const HighsOptions& options, HighsSolution& solution,
                  HighsBasis& basis, size_t numReductions) {
     reductionValues.resetPosition();