diff --git a/plugins/lsp/language-servers/ltex-settings.nix b/plugins/lsp/language-servers/ltex-settings.nix
index 1e3a523f..7a927829 100644
--- a/plugins/lsp/language-servers/ltex-settings.nix
+++ b/plugins/lsp/language-servers/ltex-settings.nix
@@ -574,7 +574,7 @@ in {
 
   diagnosticSeverity =
     helpers.defaultNullOpts.mkNullable
-    (with types; either string (attrsOf str))
+    (with types; either str (attrsOf str))
     "information"
     ''
       Severity of the diagnostics corresponding to the grammar and spelling errors.
diff --git a/plugins/utils/specs.nix b/plugins/utils/specs.nix
index 77b179bc..ebfbdc99 100644
--- a/plugins/utils/specs.nix
+++ b/plugins/utils/specs.nix
@@ -106,12 +106,12 @@ in {
     };
 
     ignored_filetypes = mkOption {
-      type = with types; listOf string;
+      type = with types; listOf str;
       default = [];
     };
 
     ignored_buffertypes = mkOption {
-      type = with types; listOf string;
+      type = with types; listOf str;
       default = ["nofile"];
     };
   };