diff --git a/core/lib/Drupal/Component/Serialization/YamlPecl.php b/core/lib/Drupal/Component/Serialization/YamlPecl.php
index fcc5f80..ec48a29 100644
--- a/core/lib/Drupal/Component/Serialization/YamlPecl.php
+++ b/core/lib/Drupal/Component/Serialization/YamlPecl.php
@@ -18,9 +18,6 @@ public static function encode($data) {
       ini_set('yaml.output_indent', 2);
       // Do not break lines at 80 characters.
       ini_set('yaml.output_width', -1);
-      // Decode binary, since Symfony YAML parser encodes binary from 3.1
-      // onwards.
-      ini_set('yaml.decode_binary', 1);
       $init = TRUE;
     }
     return yaml_emit($data, YAML_UTF8_ENCODING, YAML_LN_BREAK);
@@ -30,6 +27,13 @@ public static function encode($data) {
    * {@inheritdoc}
    */
   public static function decode($raw) {
+    static $init;
+    if (!isset($init)) {
+      // Decode binary, since Symfony YAML parser encodes binary from 3.1
+      // onwards.
+      ini_set('yaml.decode_binary', 1);
+      $init = TRUE;
+    }
     // yaml_parse() will error with an empty value.
     if (!trim($raw)) {
       return NULL;