diff --git a/libqpdf/QTC.cc b/libqpdf/QTC.cc
index 1ca79c05..8188846c 100644
--- a/libqpdf/QTC.cc
+++ b/libqpdf/QTC.cc
@@ -1,8 +1,8 @@
 #include <qpdf/QTC.hh>
 
 #include <qpdf/QUtil.hh>
-#include <set>
 #include <map>
+#include <set>
 #include <stdio.h>
 
 static bool