diff --git a/src/ModelWindow.cpp b/src/ModelWindow.cpp
index 757bd2f55..7aa754cd5 100644
--- a/src/ModelWindow.cpp
+++ b/src/ModelWindow.cpp
@@ -24,6 +24,7 @@
 #include "IntervalItem.h"
 #include "math.h"
 #include "Units.h" // for MILES_PER_KM
+#include "Colors.h" // for MILES_PER_KM
 
 #include <QtGui>
 #include <QString>