diff --git a/src/llmq/dkgsession.h b/src/llmq/dkgsession.h
index e708cf7762..633cdc64a5 100644
--- a/src/llmq/dkgsession.h
+++ b/src/llmq/dkgsession.h
@@ -12,6 +12,8 @@
 
 #include <llmq/utils.h>
 
+#include <optional>
+
 class UniValue;
 class CInv;