diff --git a/modules/global/presolve_downforce.m b/modules/global/presolve_downforce.m
index 2ab42c53..c51b101a 100644
--- a/modules/global/presolve_downforce.m
+++ b/modules/global/presolve_downforce.m
@@ -10,7 +10,7 @@
     % Search for y >= x1 + x2 +...
     candidates = find(ff(:,1)==0);
     for i = 1:length(candidates)
-        row = p.F_struc(candidates(i),2:end);
+        row = ff(candidates(i),2:end);
         xx = find(row==-1);
         yy = find(row==1);
         if length(yy)==1 && length(xx)+1==nnz(row)
diff --git a/modules/global/presolve_upforce.m b/modules/global/presolve_upforce.m
index 001db0e0..b4854f68 100644
--- a/modules/global/presolve_upforce.m
+++ b/modules/global/presolve_upforce.m
@@ -10,7 +10,7 @@
     % Search for y <= x1 + x2 +...
     candidates = find(ff(:,1)==0);
     for i = 1:length(candidates)
-        row = p.F_struc(candidates(i),2:end);
+        row = ff(candidates(i),2:end);
         xx = find(row==1);
         yy = find(row==-1);
         if length(yy)==1 && length(xx)+1==nnz(row)