diff --git a/neat/read_simulator/utils/options.py b/neat/read_simulator/utils/options.py
index fd05b6de..2104dd32 100644
--- a/neat/read_simulator/utils/options.py
+++ b/neat/read_simulator/utils/options.py
@@ -155,7 +155,7 @@ def __init__(self,
         self.discard_bed: Path | None = discard_bed
         self.mutation_model: Path | None = mutation_model
         self.mutation_rate: float | None = mutation_rate
-        self.mutation_bed: str | None = mutation_bed
+        self.mutation_bed: Path | None = mutation_bed
         self.quality_offset: int = quality_offset
 
         self.paired_ended: bool = paired_ended