diff --git a/src/pmc/callcontext.pmc b/src/pmc/callcontext.pmc
index 6bfd16657e..a6dcab3767 100644
--- a/src/pmc/callcontext.pmc
+++ b/src/pmc/callcontext.pmc
@@ -827,10 +827,10 @@ return current Namespace
         GET_ATTR_num_positionals(INTERP, SELF, num_pos);
         ensure_positionals_storage(INTERP, SELF, num_pos + 1);
 
-        Pcc_cell *cell = get_cell_at(INTERP, SELF, pos);
-        cell->u.n      = value;
-        cell->type     = FLOATCELL;
-        SET_ATTR_num_positionals(INTERP, SELF, pos + 1);
+        GET_ATTR_positionals(INTERP, SELF, cells);
+        cells[num_pos].u.n      = value;
+        cells[num_pos].type     = FLOATCELL;
+        SET_ATTR_num_positionals(INTERP, SELF, num_pos + 1);
     }
 
     VTABLE void push_string(STRING *value) {
@@ -841,9 +841,9 @@ return current Namespace
         ensure_positionals_storage(INTERP, SELF, num_pos + 1);
 
         GET_ATTR_positionals(INTERP, SELF, cells);
-        cell->u.s      = value;
-        cell->type     = STRINGCELL;
-        SET_ATTR_num_positionals(INTERP, SELF, pos + 1);
+        cells[num_pos].u.s      = value;
+        cells[num_pos].type     = STRINGCELL;
+        SET_ATTR_num_positionals(INTERP, SELF, num_pos + 1);
     }
 
     VTABLE void push_pmc(PMC *value) {
@@ -854,9 +854,9 @@ return current Namespace
         ensure_positionals_storage(INTERP, SELF, num_pos + 1);
 
         GET_ATTR_positionals(INTERP, SELF, cells);
-        cell->u.p      = value;
-        cell->type     = PMCCELL;
-        SET_ATTR_num_positionals(INTERP, SELF, pos + 1);
+        cells[num_pos].u.p      = value;
+        cells[num_pos].type     = PMCCELL;
+        SET_ATTR_num_positionals(INTERP, SELF, num_pos + 1);
     }
 
     /*