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-rw-r--r--xmlsecurity/source/helper/ooxmlsecparser.hxx1
1 files changed, 1 insertions, 0 deletions
diff --git a/xmlsecurity/source/helper/ooxmlsecparser.hxx b/xmlsecurity/source/helper/ooxmlsecparser.hxx
index 5fe6f53eb701..bb27a219ea28 100644
--- a/xmlsecurity/source/helper/ooxmlsecparser.hxx
+++ b/xmlsecurity/source/helper/ooxmlsecparser.hxx
@@ -18,6 +18,7 @@
#include <xmloff/nmspmap.hxx>
#include <memory>
+#include <optional>
#include <stack>
class XSecController;