diff --git a/src/slic3r/GUI/EncodedFilament.hpp b/src/slic3r/GUI/EncodedFilament.hpp
index f949f3b3bd..9150998b65 100644
--- a/src/slic3r/GUI/EncodedFilament.hpp
+++ b/src/slic3r/GUI/EncodedFilament.hpp
@@ -4,6 +4,7 @@
 #include <vector>
 #include <map>
 #include <math.h>
+#include <set>
 #include <unordered_map>
 #include <unordered_set>
 
@@ -225,4 +226,4 @@ private:
 };
 
 }
-#endif
\ No newline at end of file
+#endif