diff --git a/src/Detail/VarCrypt/MultiEncryptor.php b/src/Detail/VarCrypt/MultiEncryptor.php
index 2d8394d..55d9dd5 100644
--- a/src/Detail/VarCrypt/MultiEncryptor.php
+++ b/src/Detail/VarCrypt/MultiEncryptor.php
@@ -30,11 +30,7 @@ public function applyVariables($groups, $separator = '_')
         foreach ($groups as $group) {
             $values = $this->getVariables($group);
 
-            foreach ($values as $variable => $value) {
-                $name = $group . $separator . $variable;
-
-                $this->setEnvironmentVariable($name, $value);
-            }
+            $this->setEnvironmentVariables($values, $group, $separator);
         }
     }
 
@@ -112,6 +108,26 @@ public function decode($value)
         return $values;
     }
 
+    /**
+     * Recursively set environment variables (for each leaf).
+     *
+     * @param array $values
+     * @param string $prefix
+     * @param string $separator
+     */
+    protected function setEnvironmentVariables(array $values, $prefix, $separator = '_')
+    {
+        foreach ($values as $variable => $value) {
+            $name = $prefix . $separator . $variable;
+
+            if (is_array($value)) {
+                $this->setEnvironmentVariables($value, $name, $separator);
+            } else {
+                $this->setEnvironmentVariable($name, $value);
+            }
+        }
+    }
+
     /**
      * @param string $errorMessage
      */