diff --git a/src/Psalm/Internal/Codebase/Functions.php b/src/Psalm/Internal/Codebase/Functions.php
index 1755b4970..fdaf2767a 100644
--- a/src/Psalm/Internal/Codebase/Functions.php
+++ b/src/Psalm/Internal/Codebase/Functions.php
@@ -393,6 +393,10 @@ class Functions
             return true;
         }
 
+        if ($function_id === 'func_num_args' || $function_id === 'func_get_args') {
+            return true;
+        }
+
         if ($function_id === 'count' && isset($args[0]) && $type_provider) {
             $count_type = $type_provider->getType($args[0]->value);