diff --git a/src/diagnostics.lua b/src/diagnostics.lua
index 5d0c466..87dbc65 100644
--- a/src/diagnostics.lua
+++ b/src/diagnostics.lua
@@ -218,8 +218,13 @@ function M.validate_diagnostics(content, workspace_types, root_dir)
           if type_part:match("%s+OF%s+") then
             base_type = type_part:match('.*%s+OF%s+"([^"]+)"') or type_part:match(".*%s+OF%s+([%w_]+)")
           end
+
+          local is_array_keyword = base_type and base_type:upper() == "ARRAY"
+              and type_part:match("^[Aa][Rr][Rr][Aa][Yy]%[")
+
           local upper_type = base_type and base_type:upper() or nil
           if base_type and base_type ~= "" and
+             not is_array_keyword and
              not all_types[base_type] and
              not builtin.is_known_data_type(upper_type) and
              not builtin.is_known_type_or_instruction(upper_type) then