diff --git a/source/blender/blentranslation/intern/blt_translation.cc b/source/blender/blentranslation/intern/blt_translation.cc
index 563432482de..a27d5183605 100644
--- a/source/blender/blentranslation/intern/blt_translation.cc
+++ b/source/blender/blentranslation/intern/blt_translation.cc
@@ -11,6 +11,7 @@
 
 #include <cstdlib>
 #include <cstring>
+#include <optional>
 
 #include "BLT_translation.hh"