diff --git a/doomsday/libgui/src/graphics/rowatlasallocator.cpp b/doomsday/libgui/src/graphics/rowatlasallocator.cpp
index 1fd55592ee..7c635fcdbd 100644
--- a/doomsday/libgui/src/graphics/rowatlasallocator.cpp
+++ b/doomsday/libgui/src/graphics/rowatlasallocator.cpp
@@ -338,7 +338,7 @@ DENG2_PIMPL(RowAtlasAllocator)
             }
 
             // Got a place, mark it down.
-            if(Slot *addedSlot = slot->allocateAndSplit(id? Id(id) : Id(), size.x))
+            if(Slot *addedSlot = slot->allocateAndSplit(id? Id(id) : Id(), needed.x))
             {
                 addVacant(addedSlot);
             }