diff --git a/src/libslic3r/Utils.hpp b/src/libslic3r/Utils.hpp
index 66cd56d70..4a3682580 100644
--- a/src/libslic3r/Utils.hpp
+++ b/src/libslic3r/Utils.hpp
@@ -1,6 +1,7 @@
 #ifndef slic3r_Utils_hpp_
 #define slic3r_Utils_hpp_
 
+#include <iomanip>
 #include <locale>
 #include <utility>
 #include <functional>