diff --git a/github_ffa/problems/ghffa01.py b/github_ffa/problems/ghffa01.py
index fd78846..915ba36 100644
--- a/github_ffa/problems/ghffa01.py
+++ b/github_ffa/problems/ghffa01.py
@@ -44,7 +44,6 @@ def get_problem(alpha: float):
         lb=None,
         ub=None,
         name=f"GHFFA01_{alpha=}",
-        optimal_cost=0.5 / (1 + alpha**2),
     )
 
 
diff --git a/github_ffa/problems/ghffa02.py b/github_ffa/problems/ghffa02.py
index 873a9bc..b607286 100644
--- a/github_ffa/problems/ghffa02.py
+++ b/github_ffa/problems/ghffa02.py
@@ -42,7 +42,6 @@ def get_problem(alpha: float):
         lb=None,
         ub=None,
         name=f"GHFFA02_{alpha=}",
-        optimal_cost=0.5 / alpha**2,
     )
 
 
diff --git a/github_ffa/problems/ghffa03.py b/github_ffa/problems/ghffa03.py
index 36ee789..09ce035 100644
--- a/github_ffa/problems/ghffa03.py
+++ b/github_ffa/problems/ghffa03.py
@@ -45,7 +45,6 @@ def get_problem(n: int):
         lb=None,
         ub=None,
         name=f"GHFFA03_{n=}",
-        optimal_cost=0.0,
     )