diff --git a/.config/s3.config.php b/.config/s3.config.php
index 6d0ede91..d8bd6770 100644
--- a/.config/s3.config.php
+++ b/.config/s3.config.php
@@ -23,6 +23,10 @@ if (getenv('OBJECTSTORE_S3_BUCKET')) {
     )
   );
 
+  if (getenv('OBJECTSTORE_S3_SSE_C_KEY')) {
+    $CONFIG['objectstore']['arguments']['sse_c_key'] = getenv('OBJECTSTORE_S3_SSE_C_KEY');
+  }
+
   if (getenv('OBJECTSTORE_S3_KEY_FILE') && file_exists(getenv('OBJECTSTORE_S3_KEY_FILE'))) {
     $CONFIG['objectstore']['arguments']['key'] = trim(file_get_contents(getenv('OBJECTSTORE_S3_KEY_FILE')));
   } elseif (getenv('OBJECTSTORE_S3_KEY')) {