diff --git a/compiler/mono/src/borrow.rs b/compiler/mono/src/borrow.rs
index e6221e798b..cd89f63ef1 100644
--- a/compiler/mono/src/borrow.rs
+++ b/compiler/mono/src/borrow.rs
@@ -696,14 +696,14 @@ impl<'a> BorrowInfState<'a> {
                     ListWalk | ListWalkUntil | ListWalkBackwards | DictWalk => {
                         match param_map.get_symbol(arguments[2], closure_layout) {
                             Some(function_ps) => {
-                                // own the data structure if the function wants to own the element
+                                // own the default value if the function wants to own it
                                 if !function_ps[0].borrow {
-                                    self.own_var(arguments[0]);
+                                    self.own_var(arguments[1]);
                                 }
 
-                                // own the default value if the function wants to own it
+                                // own the data structure if the function wants to own the element
                                 if !function_ps[1].borrow {
-                                    self.own_var(arguments[1]);
+                                    self.own_var(arguments[0]);
                                 }
 
                                 // own the closure environment if the function needs to own it
diff --git a/compiler/mono/src/inc_dec.rs b/compiler/mono/src/inc_dec.rs
index 9622355cc7..8aebc86fdc 100644
--- a/compiler/mono/src/inc_dec.rs
+++ b/compiler/mono/src/inc_dec.rs
@@ -643,8 +643,8 @@ impl<'a> Context<'a> {
                                 // borrow data structure based on first argument of the folded function
                                 // borrow the default based on second argument of the folded function
                                 let borrows = [
-                                    function_ps[0].borrow,
                                     function_ps[1].borrow,
+                                    function_ps[0].borrow,
                                     FUNCTION,
                                     CLOSURE_DATA,
                                 ];
@@ -656,7 +656,7 @@ impl<'a> Context<'a> {
                                     b_live_vars,
                                 );
 
-                                let b = decref_if_owned!(function_ps[0].borrow, arguments[0], b);
+                                let b = decref_if_owned!(function_ps[1].borrow, arguments[0], b);
 
                                 let v = create_call!(function_ps.get(2));