diff --git a/models/tshock.mod b/models/tshock.mod
index 71b706d86c1d72f144394b311d23b0cdcf5fb906..ba3c1223e914884d5e1791527ace44764945513b 100644
--- a/models/tshock.mod
+++ b/models/tshock.mod
@@ -86,7 +86,7 @@ shocks;
 
 end;
 
-perfect_foresight_setup(periods=@{PERIODS_VALUE});
+perfect_foresight_setup(periods=@{PERIODS});
 perfect_foresight_solver(no_homotopy, markowitz=@{MARKOWITZ_VALUE}, stack_solve_algo = @{STACK_SOLVE_ALGO_VALUE}, solve_algo = @{STEADY_SOLVE_ALGO_VALUE});
 
 end;