diff --git a/src/LinearMath/btMotionState.h b/src/LinearMath/btMotionState.h
index 516b9b055..6b26257bf 100644
--- a/src/LinearMath/btMotionState.h
+++ b/src/LinearMath/btMotionState.h
@@ -16,6 +16,9 @@ subject to the following restrictions:
 #ifndef BT_MOTIONSTATE_H
 #define BT_MOTIONSTATE_H
 
+#include "LinearMath/btVector3.h"
+#include "LinearMath/btQuaternion.h"
+
 
 ///btMotionState allows the dynamics world to synchronize the updated world transforms with graphics
 ///For optimizations, potentially only moving objects get synchronized (using setWorldPosition/setWorldOrientation)