diff --git a/src/pe/raytracing/Ray.h b/src/pe/raytracing/Ray.h
index 5bb77c10929892b38a2ae39641f4f7888770256f..82d659dccbf7375dbb5f2c810a05cfb5f16a4f00 100644
--- a/src/pe/raytracing/Ray.h
+++ b/src/pe/raytracing/Ray.h
@@ -214,12 +214,11 @@ public:
     *
     * \return Ray transformed to the body frame.
     */
-   Ray transformedToBF(const BodyID body) const {
+   inline Ray transformedToBF(const BodyID body) const {
       return Ray(body->pointFromWFtoBF(getOrigin()), body->vectorFromWFtoBF(getDirection()));
    }
    //@}
 };
-
 }
 }
 }