diff --git a/pyrefly/lib/lsp/wasm/inlay_hints.rs b/pyrefly/lib/lsp/wasm/inlay_hints.rs
index 03aae383c4..a35a9b0437 100644
--- a/pyrefly/lib/lsp/wasm/inlay_hints.rs
+++ b/pyrefly/lib/lsp/wasm/inlay_hints.rs
@@ -589,6 +589,7 @@ impl<'a> Transaction<'a> {
                                 && param_match.name.as_str() != "__self"
                                 && param_match.name.as_str() != "cls"
                                 && param_match.name.as_str() != "_cls"
+                                && !matches!(arg, Expr::Name(name) if name.id == *param_match.name)
                             {
                                 param_hints.push((
                                     arg.range().start(),
diff --git a/pyrefly/lib/test/lsp/inlay_hint.rs b/pyrefly/lib/test/lsp/inlay_hint.rs
index a9f2133479..21e7644c53 100644
--- a/pyrefly/lib/test/lsp/inlay_hint.rs
+++ b/pyrefly/lib/test/lsp/inlay_hint.rs
@@ -608,6 +608,45 @@ test("a", "b")
     assert_eq!(parameter_name_hint_labels(code, true), vec!["a= ", "b= "]);
 }
 
+#[test]
+fn test_issue_5105_hide_hint_when_arg_matches_param_name() {
+    // A matching name is hidden while a different name still shows.
+    let code = r#"
+def foo(a: int, b: int) -> None:
+    pass
+
+a = 1
+c = 2
+foo(a, c)
+"#;
+    assert_eq!(parameter_name_hint_labels(code, true), vec!["b= "]);
+
+    // Every argument matching leaves no hints.
+    let code = r#"
+def foo(a: int, b: int) -> None:
+    pass
+
+a = 1
+b = 2
+foo(a, b)
+"#;
+    assert_eq!(parameter_name_hint_labels(code, true), Vec::<String>::new());
+
+    // obj.a against parameter a still shows a=, so only plain names are suppressed.
+    let code = r#"
+class Box:
+    a: int = 1
+
+def foo(a: int, b: int) -> None:
+    pass
+
+obj = Box()
+c = 2
+foo(obj.a, c)
+"#;
+    assert_eq!(parameter_name_hint_labels(code, true), vec!["a= ", "b= "]);
+}
+
 #[test]
 fn test_parameter_name_hints_with_varargs() {
     let code = r#"