diff --git a/playwright/_impl/_locator.py b/playwright/_impl/_locator.py
index 55b1df75a..990d055fd 100644
--- a/playwright/_impl/_locator.py
+++ b/playwright/_impl/_locator.py
@@ -822,6 +822,10 @@ def get_by_text_selector(text: Union[str, Pattern[str]], exact: bool = None) ->
     return "internal:text=" + escape_for_text_selector(text, exact=exact)
 
 
+def bool_to_js_bool(value: bool) -> str:
+    return "true" if value else "false"
+
+
 def get_by_role_selector(
     role: AriaRole,
     checked: bool = None,
@@ -836,15 +840,15 @@ def get_by_role_selector(
 ) -> str:
     props: List[Tuple[str, str]] = []
     if checked is not None:
-        props.append(("checked", str(checked)))
+        props.append(("checked", bool_to_js_bool(checked)))
     if disabled is not None:
-        props.append(("disabled", str(disabled)))
+        props.append(("disabled", bool_to_js_bool(disabled)))
     if selected is not None:
-        props.append(("selected", str(selected)))
+        props.append(("selected", bool_to_js_bool(selected)))
     if expanded is not None:
-        props.append(("expanded", str(expanded)))
+        props.append(("expanded", bool_to_js_bool(expanded)))
     if includeHidden is not None:
-        props.append(("include-hidden", str(includeHidden)))
+        props.append(("include-hidden", bool_to_js_bool(includeHidden)))
     if level is not None:
         props.append(("level", str(level)))
     if name is not None:
@@ -857,6 +861,6 @@ def get_by_role_selector(
             )
         )
     if pressed is not None:
-        props.append(("pressed", str(pressed)))
+        props.append(("pressed", bool_to_js_bool(pressed)))
     props_str = "".join([f"[{t[0]}={t[1]}]" for t in props])
     return f"internal:role={role}{props_str}"
diff --git a/tests/async/test_selectors_get_by.py b/tests/async/test_selectors_get_by.py
index 88cb50947..1a07d1a9a 100644
--- a/tests/async/test_selectors_get_by.py
+++ b/tests/async/test_selectors_get_by.py
@@ -161,3 +161,20 @@ async def test_get_by_role_escaping(
         )
         == []
     )
+
+
+async def test_include_hidden_should_work(
+    page: Page,
+) -> None:
+    await page.set_content("""<button style="display: none">Hidden</button>""")
+    assert (
+        await page.get_by_role("button", name="Hidden").evaluate_all(
+            "els => els.map(e => e.outerHTML)"
+        )
+        == []
+    )
+    assert await page.get_by_role(
+        "button", name="Hidden", include_hidden=True
+    ).evaluate_all("els => els.map(e => e.outerHTML)") == [
+        """<button style="display: none">Hidden</button>""",
+    ]