diff --git a/lib/private/Files/ObjectStore/S3ConnectionTrait.php b/lib/private/Files/ObjectStore/S3ConnectionTrait.php
index cce8752c3604c..65fc61ffa7789 100644
--- a/lib/private/Files/ObjectStore/S3ConnectionTrait.php
+++ b/lib/private/Files/ObjectStore/S3ConnectionTrait.php
@@ -213,7 +213,7 @@ protected function getCertificateBundlePath(): ?string {
 	}
 
 	protected function getSSECKey(): ?string {
-		if (isset($this->params['sse_c_key'])) {
+		if (isset($this->params['sse_c_key']) && !empty($this->params['sse_c_key'])) {
 			return $this->params['sse_c_key'];
 		}