diff --git a/CHANGELOG.md b/CHANGELOG.md
index 29eb452..869ec16 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## 3.0.2 - 2021-04-16
+### Changed
+- The keys of posted arrays are now preserved when a submission is flagged as spam.
+
 ## 3.0.1 - 2021-04-14
 ### Fixed
 - Fixed a bug in which an error could be thrown if values were passed in as an array and a submission was flagged as spam.
diff --git a/composer.json b/composer.json
index 80ddc5e..cdb5ba6 100644
--- a/composer.json
+++ b/composer.json
@@ -1,7 +1,7 @@
 {
     "name": "putyourlightson/craft-snaptcha",
     "description": "Automatically validates forms and prevents spam bots from submitting to your site.",
-    "version": "3.0.1",
+    "version": "3.0.2",
     "type": "craft-plugin",
     "homepage": "https://putyourlightson.com/plugins/snaptcha",
     "license": "proprietary",
diff --git a/src/Snaptcha.php b/src/Snaptcha.php
index 3ddeb88..d87307d 100644
--- a/src/Snaptcha.php
+++ b/src/Snaptcha.php
@@ -102,7 +102,7 @@ public function validateField(ActionEvent $event)
         if ($this->validated === false) {
             $variables = [
                 'settings' => $this->settings,
-                'postedValues' => Craft::$app->request->getBodyParams(),
+                'postedValues' => $this->snaptcha->getPostedValues(),
             ];
 
             if ($this->settings->errorTemplate) {
diff --git a/src/services/SnaptchaService.php b/src/services/SnaptchaService.php
index 8d6f1bc..a7b42e5 100644
--- a/src/services/SnaptchaService.php
+++ b/src/services/SnaptchaService.php
@@ -67,6 +67,17 @@ public function getFieldValue(SnaptchaModel $model)
         return $record ? $record->value : null;
     }
 
+    public function getPostedValues(): array
+    {
+        $values = Craft::$app->request->getBodyParams();
+
+        if (isset($values[Snaptcha::$plugin->settings->fieldName])) {
+            unset($values[Snaptcha::$plugin->settings->fieldName]);
+        }
+
+        return $this->_flattenValues($values);
+    }
+
     /**
      * Returns whether the controller action is excluded from validation.
      *
@@ -342,6 +353,32 @@ private function _getNormalizedArray($values): array
         return $values;
     }
 
+    /**
+     * Flattens a multi-dimensional array of values to a flat array that can
+     * be used to output hidden fields, preserving the keys.
+     *
+     * @param array $values
+     * @param string $currentKey
+     * @return array
+     */
+    private function _flattenValues(array $values, string $currentKey = ''): array
+    {
+        $flattened = [];
+
+        foreach ($values as $key => $value) {
+            $key = $currentKey ? $currentKey.'['.$key.']' : $key;
+
+            if (is_array($value)) {
+                $flattened = array_merge($flattened, $this->_flattenValues($value, $key));
+            }
+            else {
+                $flattened[$key] = $value;
+            }
+        }
+
+        return $flattened;
+    }
+
     /**
      * Rejects and logs a form submission.
      *
diff --git a/src/templates/_error.html b/src/templates/_error.html
index b2fd030..aebe977 100644
--- a/src/templates/_error.html
+++ b/src/templates/_error.html
@@ -4,16 +4,6 @@
 
 {% set title = settings.errorTitle %}
 
-{% macro hiddenInput(name, value) %}
-    {% if value is iterable %}
-        {% for val in value %}
-            {{ _self.hiddenInput(name ~ '[]', val) }}
-        {% endfor %}
-    {% else %}
-        {{ hiddenInput(name, value) }}
-    {% endif %}
-{% endmacro %}
-
 
 {% block message %}
 
@@ -28,8 +18,8 @@ <h2>{{ settings.errorTitle }}</h2>
     </p>
 
     <form action="" method="post">
-        {% for name, value in postedValues if name != 'snaptcha' %}
-            {{ _self.hiddenInput(name, value) }}
+        {% for name, value in postedValues %}
+            {{ hiddenInput(name, value) }}
         {% endfor %}
 
         {{ craft.snaptcha.field }}