diff --git a/Components/Hlms/Pbs/src/OgreHlmsPbsDatablock.cpp b/Components/Hlms/Pbs/src/OgreHlmsPbsDatablock.cpp
index 24c35e74ab3..cb8295514ec 100644
--- a/Components/Hlms/Pbs/src/OgreHlmsPbsDatablock.cpp
+++ b/Components/Hlms/Pbs/src/OgreHlmsPbsDatablock.cpp
@@ -960,6 +960,7 @@ namespace Ogre
         mUserValue[userValueIdx][1] = value.y;
         mUserValue[userValueIdx][2] = value.z;
         mUserValue[userValueIdx][3] = value.w;
+        scheduleConstBufferUpdate();
     }
     //-----------------------------------------------------------------------------------
     Vector4 HlmsPbsDatablock::getUserValue(uint8 userValueIdx) const