diff --git a/stepmania/src/Background.cpp b/stepmania/src/Background.cpp
index 827167dd67..2b575e8a80 100644
--- a/stepmania/src/Background.cpp
+++ b/stepmania/src/Background.cpp
@@ -16,7 +16,6 @@
 #include "ThemeMetric.h"
 #include "PlayerState.h"
 #include "ActorUtil.h"
-#include <set>
 #include <float.h>
 #include "XmlFile.h"
 #include "XmlFileUtil.h"