diff --git a/configurations/base.ini b/configurations/base.ini
index c2cc123d30c..b090da7946e 100644
--- a/configurations/base.ini
+++ b/configurations/base.ini
@@ -504,6 +504,7 @@ allowed[] = application/pdf
 allowed[] = application/msword
 allowed[] = application/vnd.ms-office
 allowed[] = application/vnd.ms-powerpoint
+allowed[] = application/vnd.openxmlformats-officedocument.presentationml.presentation
 allowed[] = application/xml
 allowed[] = application/x-gzip
 allowed[] = application/zip