diff --git a/rdstar/offline_analysis/fitting/dedicated_fit_approach/plotting_tools.py b/rdstar/offline_analysis/fitting/dedicated_fit_approach/plotting_tools.py
index d2941023f5d010174f12d4523e1ec4037c1887c6..20434ae1f56174cecb579dd16955951aaf661967 100644
--- a/rdstar/offline_analysis/fitting/dedicated_fit_approach/plotting_tools.py
+++ b/rdstar/offline_analysis/fitting/dedicated_fit_approach/plotting_tools.py
@@ -638,7 +638,7 @@ class SystematicsShapePlotter:
                 shape_plot_info=_shape_plot_info,
             )
 
-            var_str: str = "" if number_of_subsets == 1 else f"({subset_id})"
+            var_str: str = "" if number_of_subsets == 1 else f" ({subset_id})"
             title_str: str = sys_shape_info.latex_str + f" Sys. Shape Effect{var_str} in " + reco_ch_info.latex_label
             fig.suptitle(title_str, fontsize=18)