diff --git a/librecad/src/lib/engine/rs_ellipse.cpp b/librecad/src/lib/engine/rs_ellipse.cpp
index b6253388..549f3a01 100644
--- a/librecad/src/lib/engine/rs_ellipse.cpp
+++ b/librecad/src/lib/engine/rs_ellipse.cpp
@@ -47,6 +47,7 @@
 #ifndef Q_MOC_RUN
 #include <boost/version.hpp>
 #include <boost/math/tools/roots.hpp>
+#include <boost/math/tools/tuple.hpp>
 #include <boost/math/special_functions/ellint_2.hpp>
 #endif