diff --git a/EasyFEA/simulations/_phasefield.py b/EasyFEA/simulations/_phasefield.py
index 9add76df..1d4ca246 100644
--- a/EasyFEA/simulations/_phasefield.py
+++ b/EasyFEA/simulations/_phasefield.py
@@ -804,7 +804,7 @@ def Results_Set_Iteration_Summary(self, iter: int, load: float, unitLoad: str, p
 
         min_d = d.min()
         max_d = d.max()
-        summaryIter = f"{iter+1:4} : {load:4.3f} {unitLoad}, [{min_d:.2e}; {max_d:.2e}], {Niter}:{timeIter:4.3f} s, tol={dincMax:.2e}  "
+        summaryIter = f"{iter+1:4d} : {load:4.3f} {unitLoad}, [{min_d:.2e}; {max_d:.2e}], {Niter}:{timeIter:4.3f} s, tol={dincMax:.2e}  "
         
         if remove:
             end='\r'