diff --git a/libs/vkd3d-shader/fx.c b/libs/vkd3d-shader/fx.c
index 636e8efcc..c475a46da 100644
--- a/libs/vkd3d-shader/fx.c
+++ b/libs/vkd3d-shader/fx.c
@@ -3234,7 +3234,7 @@ static void write_fx_4_buffer(struct hlsl_buffer *b, struct fx_write_context *fx
             continue;
 
         write_fx_4_numeric_variable(var, shared, fx);
-        size += get_fx_4_type_size(var->data_type);
+        size = max(size, get_fx_4_type_size(var->data_type) + var->buffer_offset * 4);
         ++count;
     }