diff --git a/toonz/sources/toonzlib/orientation.cpp b/toonz/sources/toonzlib/orientation.cpp
index 9aa6540..9a15bf1 100644
--- a/toonz/sources/toonzlib/orientation.cpp
+++ b/toonz/sources/toonzlib/orientation.cpp
@@ -5,6 +5,7 @@
 #include <QPainterPath>
 #include <QBoxLayout>
 #include <math.h>
+#include <stdexcept>
 
 using std::pair;