diff --git a/src/Math/Vector.h b/src/Math/Vector.h
index 63355fd9f..3ec9a3d69 100644
--- a/src/Math/Vector.h
+++ b/src/Math/Vector.h
@@ -148,7 +148,7 @@ template<class T, size_t size> class Vector {
         }
 
         /** @brief Normalized vector (of length 1) */
-        Vector<T, size> normalized() const {
+        inline Vector<T, size> normalized() const {
             return *this/length();
         }