diff --git a/htsinfer/models.py b/htsinfer/models.py
index 8db42f6..6b8c2f9 100644
--- a/htsinfer/models.py
+++ b/htsinfer/models.py
@@ -95,7 +95,7 @@ class ReadLength(BaseModel):
     min: Optional[int] = None
     max: Optional[int] = None
     mean: Optional[float] = None
-    median: Optional[float] = None
+    median: Optional[int] = None
     mode: Optional[int] = None