diff --git a/src/seismic_hazard_forecasting.py b/src/seismic_hazard_forecasting.py
index c711f4f..dd8cb7e 100644
--- a/src/seismic_hazard_forecasting.py
+++ b/src/seismic_hazard_forecasting.py
@@ -505,7 +505,8 @@ verbose: {verbose}")
 
             # Save the figure
             fig.canvas.draw()
-            plt.savefig("overlay_" + str(j) + ".svg", bbox_inches="tight", pad_inches=0, transparent=True)
+            svg_path = f"overlay_{j}.svg"
+            plt.savefig(svg_path, bbox_inches="tight", pad_inches=0, transparent=True)
             plt.close(fig)