diff --git a/Source/Engine/Core/Math/Int4.h b/Source/Engine/Core/Math/Int4.h
index 05b951e62..82b9facd4 100644
--- a/Source/Engine/Core/Math/Int4.h
+++ b/Source/Engine/Core/Math/Int4.h
@@ -6,10 +6,6 @@
 #include "Engine/Core/Formatting.h"
 #include "Engine/Core/Templates.h"
 
-struct Vector2;
-struct Vector3;
-struct Vector4;
-
 /// <summary>
 /// Four-components vector (32 bit integer type).
 /// </summary>