diff --git a/src/application.py b/src/application.py
index 813a846..d5992be 100644
--- a/src/application.py
+++ b/src/application.py
@@ -741,10 +741,10 @@ def edit_contest_problem(contest_id, problem_id):
     # Only edit score for statically scored problems whose value has changed
     if data[0]["score_users"] == -1 and data[0]["point_value"] != new_points:
         point_change = int(new_points) - data[0]["point_value"]
-        db.execute(("UPDATE contest_users SET points=? WHERE contest_id=? AND user_id "
-                    "IN (SELECT user_id FROM contest_solved WHERE contest_id=? AND "
-                    "problem_id=?)"),
-                   point_change, contest_id, contest_id, problem_id)
+        db.execute(("UPDATE contest_users SET points=points+:point_change WHERE "
+                    "contest_id=:cid AND user_id IN (SELECT user_id FROM contest_solved "
+                    "WHERE contest_id=:cid AND problem_id=:pid)"),
+                   point_change=point_change, cid=contest_id, pid=problem_id)
         db.execute(("UPDATE contest_problems SET point_value=:pv WHERE contest_id=:cid "
                     "AND problem_id=:pid"),
                    pv=int(new_points), cid=contest_id, pid=problem_id)
diff --git a/src/helpers.py b/src/helpers.py
index 891b49a..f1a9b76 100644
--- a/src/helpers.py
+++ b/src/helpers.py
@@ -156,10 +156,11 @@ def update_dyn_score(contest_id, problem_id, update_curr_user=True):
                    cid=contest_id, points=old_points, uid=session["user_id"])
 
     # Update points of all users who previously solved the problem
-    db.execute(("UPDATE contest_users SET points=points + ? WHERE contest_id=? AND "
-                "user_id IN (SELECT user_id FROM contest_solved WHERE "
-                "contest_id=? AND problem_id=?)"),
-               point_diff, contest_id, contest_id, problem_id)
+    db.execute(("UPDATE contest_users SET points=points+:point_change "
+                "WHERE contest_id=:cid AND user_id IN "
+                "(SELECT user_id FROM contest_solved WHERE "
+                "contest_id=:cid AND problem_id=:pid)"),
+               point_change=point_diff, cid=contest_id, pid=problem_id)
     db.execute("COMMIT")