diff --git a/src/Base/DualQuaternion.h b/src/Base/DualQuaternion.h
index 1959cc787d..2f0ab52e9d 100644
--- a/src/Base/DualQuaternion.h
+++ b/src/Base/DualQuaternion.h
@@ -24,6 +24,7 @@
 #define FREECAD_BASE_DUAL_QUATERNION_H
 
 #include "DualNumber.h"
+#include <FCGlobal.h>
 //#include <Console.h> //DEBUG
 
 namespace Base {