diff --git a/src/Autocomplete/src/Form/AutocompleteChoiceTypeExtension.php b/src/Autocomplete/src/Form/AutocompleteChoiceTypeExtension.php
index b510d3fd47d..fcc9dccf05f 100644
--- a/src/Autocomplete/src/Form/AutocompleteChoiceTypeExtension.php
+++ b/src/Autocomplete/src/Form/AutocompleteChoiceTypeExtension.php
@@ -124,9 +124,9 @@ private function hasUrlParameters(string $url): bool
 
     private function validateExtraOptions(array $extraOptions): void
     {
-        foreach ($extraOptions as $option) {
+        foreach ($extraOptions as $optionKey => $option) {
             if (!\is_scalar($option) && !\is_array($option) && null !== $option) {
-                throw new \InvalidArgumentException(sprintf('Extra option "%s" must be a scalar value, an array or null. Got "%s".', $option, get_debug_type($option)));
+                throw new \InvalidArgumentException(sprintf('Extra option with key "%s" must be a scalar value, an array or null. Got "%s".', $optionKey, get_debug_type($option)));
             }
 
             if (\is_array($option)) {