diff --git a/plugin/core/sessions.py b/plugin/core/sessions.py
index 3bedb7cbb..635c106a6 100644
--- a/plugin/core/sessions.py
+++ b/plugin/core/sessions.py
@@ -330,7 +330,7 @@ def get_initialize_params(variables: dict[str, str], workspace_folders: list[Wor
             "contextSupport": True,
             "signatureInformation": {
                 "activeParameterSupport": True,
-                "noActiveParameterSupport": True,
+                "noActiveParameterSupport": False,
                 "documentationFormat": supported_markup_kinds,
                 "parameterInformation": {
                     "labelOffsetSupport": True
diff --git a/plugin/core/signature_help.py b/plugin/core/signature_help.py
index 765e0f270..82f8f022f 100644
--- a/plugin/core/signature_help.py
+++ b/plugin/core/signature_help.py
@@ -1,6 +1,7 @@
 from __future__ import annotations
+from typing import cast
 from .logging import debug
-from .protocol import SignatureHelp
+from .protocol import SignatureHelp, Uint
 from .protocol import SignatureInformation
 from .registry import LspTextCommand
 from .views import FORMAT_MARKUP_CONTENT
@@ -168,11 +169,7 @@ def _parameter_documentation(self, view: sublime.View, signature: SignatureInfor
         if not parameters:
             return None
         try:
-            active_parameter = signature.get("activeParameter")
-            # @since 3.18 active_parameter can be null
-            # in which case the client should not higlight parameters
-            if active_parameter is None:
-                return
+            active_parameter = cast(Uint,signature.get("activeParameter"))
             parameter = parameters[active_parameter or self._active_parameter_index]
         except IndexError:
             return None