diff --git a/crates/ruff_linter/src/line_width.rs b/crates/ruff_linter/src/line_width.rs
index 685e473ecc8435..83e22f790da916 100644
--- a/crates/ruff_linter/src/line_width.rs
+++ b/crates/ruff_linter/src/line_width.rs
@@ -15,7 +15,10 @@ use ruff_text_size::TextSize;
 /// The allowed range of values is 1..=320
 #[derive(Clone, Copy, Debug, Eq, PartialEq, serde::Serialize, serde::Deserialize)]
 #[cfg_attr(feature = "schemars", derive(schemars::JsonSchema))]
-pub struct LineLength(NonZeroU16);
+pub struct LineLength(
+#[cfg_attr(feature = "schemars", schemars(range(min = 1, max = 320)))]
+    NonZeroU16
+);
 
 impl LineLength {
     /// Maximum allowed value for a valid [`LineLength`]
diff --git a/ruff.schema.json b/ruff.schema.json
index 49be9e2ae2a449..b5a43347b21e09 100644
--- a/ruff.schema.json
+++ b/ruff.schema.json
@@ -1556,6 +1556,7 @@
       "description": "The length of a line of text that is considered too long.\n\nThe allowed range of values is 1..=320",
       "type": "integer",
       "format": "uint16",
+      "maximum": 320.0,
       "minimum": 1.0
     },
     "LintOptions": {