diff --git a/apps/files_encryption/lib/helper.php b/apps/files_encryption/lib/helper.php
index d3d4afff91..cbc5de41c6 100755
--- a/apps/files_encryption/lib/helper.php
+++ b/apps/files_encryption/lib/helper.php
@@ -241,6 +241,7 @@ class Helper {
 		if(openssl_pkey_new(array('private_key_bits' => 4096))) {
 			return true;
 		} else {
+			\OCP\Util::writeLog('Encryption library', 'openssl_pkey_new()fails:  ' . openssl_error_string(), \OCP\Util::ERROR);
 			return false;
 		}
 	}