diff --git a/src/libslic3r/TreeModelVolumes.cpp b/src/libslic3r/TreeModelVolumes.cpp
index 10840d1b5..96f61a07d 100644
--- a/src/libslic3r/TreeModelVolumes.cpp
+++ b/src/libslic3r/TreeModelVolumes.cpp
@@ -17,6 +17,7 @@
 #include "Print.hpp"
 #include "PrintConfig.hpp"
 #include "Utils.hpp"
+#include "format.hpp"
 
 #include <string_view>