diff --git a/pytensor/compile/profiling.py b/pytensor/compile/profiling.py
index 1af2147acd..b23ccad3e7 100644
--- a/pytensor/compile/profiling.py
+++ b/pytensor/compile/profiling.py
@@ -1402,7 +1402,7 @@ def print_stats(stats1, stats2):
             shapes = str(fct_shapes[fgraph][node])
 
             if all(hasattr(out.type, "get_size") for out in node.outputs):
-                size = "{node_outputs_size:9d}B"
+                size = f"{node_outputs_size:9d}B"
                 if node_outputs_size < config.profiling__min_memory_size:
                     N = idx
                     break