diff --git a/crates/rust-analyzer/src/lsp_ext.rs b/crates/rust-analyzer/src/lsp_ext.rs
index 7e7f96da21e1..1681c766f363 100644
--- a/crates/rust-analyzer/src/lsp_ext.rs
+++ b/crates/rust-analyzer/src/lsp_ext.rs
@@ -242,21 +242,25 @@ pub struct InlayHintsParams {
     pub text_document: TextDocumentIdentifier,
 }
 
-#[derive(Debug, PartialEq, Eq, Deserialize, Serialize)]
-pub enum InlayKind {
-    Other,
-    Type,
-    Parameter,
+#[derive(Eq, PartialEq, Debug, Copy, Clone, Serialize, Deserialize)]
+#[serde(transparent)]
+pub struct InlayHintKind(u8);
+
+impl InlayHintKind {
+    pub const OTHER: InlayHintKind = InlayHintKind(0);
+    pub const TYPE: InlayHintKind = InlayHintKind(1);
+    pub const PARAMETER: InlayHintKind = InlayHintKind(2);
 }
 
 #[derive(Debug, Deserialize, Serialize)]
+#[serde(rename_all = "camelCase")]
 pub struct InlayHint {
-    pub text: String,
-    pub range: Range,
-    pub kind: Option<InlayKind>,
-    pub description: Option<String>,
-    pub whitespace_before: Option<bool>,
-    pub whitespace_after: Option<bool>,
+    pub label: String,
+    pub position: Position,
+    pub kind: Option<InlayHintKind>,
+    pub tooltip: Option<String>,
+    pub padding_left: Option<bool>,
+    pub padding_right: Option<bool>,
 }
 
 pub enum Ssr {}
diff --git a/crates/rust-analyzer/src/to_proto.rs b/crates/rust-analyzer/src/to_proto.rs
index a5d7b3a86f78..59b5a9173986 100644
--- a/crates/rust-analyzer/src/to_proto.rs
+++ b/crates/rust-analyzer/src/to_proto.rs
@@ -412,16 +412,16 @@ pub(crate) fn signature_help(
 
 pub(crate) fn inlay_hint(line_index: &LineIndex, inlay_hint: InlayHint) -> lsp_ext::InlayHint {
     lsp_ext::InlayHint {
-        text: inlay_hint.label.to_string(),
-        range: range(line_index, inlay_hint.range),
+        label: inlay_hint.label.to_string(),
+        position: position(line_index, inlay_hint.range.start()),
         kind: Some(match inlay_hint.kind {
-            InlayKind::ParameterHint => lsp_ext::InlayKind::Parameter,
-            InlayKind::TypeHint => lsp_ext::InlayKind::Type,
-            InlayKind::ChainingHint => lsp_ext::InlayKind::Other,
+            InlayKind::ParameterHint => lsp_ext::InlayHintKind::PARAMETER,
+            InlayKind::TypeHint => lsp_ext::InlayHintKind::TYPE,
+            InlayKind::ChainingHint => lsp_ext::InlayHintKind::OTHER,
         }),
-        description: Some("test description".to_string()),
-        whitespace_before: Some(true),
-        whitespace_after: Some(true),
+        tooltip: Some("test description".to_string()),
+        padding_left: Some(true),
+        padding_right: Some(true),
     }
 }