diff --git a/hysop/iterative_method.py b/hysop/iterative_method.py
index 4de24ce1ee64676163ba3b5e7edfdfbab298e6ae..e03e11bd7f624556e32a248c3f6ae436562ee740 100644
--- a/hysop/iterative_method.py
+++ b/hysop/iterative_method.py
@@ -185,7 +185,7 @@ class IterativeMethod(Problem):
             max_iter=self.max_iter,
             dt0=self.dt0,
             dt=self.dt,
-            t=ScalarParameter(name="dummy-t", dtype=HYSOP_REAL, quiet=True),
+            t=ScalarParameter(name="dummy-t", dtype=self.dt.dtype, quiet=True),
             mpi_params=self.mpi_params,
         )
         self.configsimu(loop, simulation)