diff --git a/src/Mod/Sketcher/App/ExternalGeometryExtension.h b/src/Mod/Sketcher/App/ExternalGeometryExtension.h
index 3fd9f96cda..6eafd0a55b 100644
--- a/src/Mod/Sketcher/App/ExternalGeometryExtension.h
+++ b/src/Mod/Sketcher/App/ExternalGeometryExtension.h
@@ -24,6 +24,7 @@
 #define SKETCHER_EXTERNALGEOMETRYEXTENSION_H
 
 #include <Mod/Part/App/Geometry.h>
+#include <array>
 
 namespace Sketcher
 {