diff --git a/gfx/drivers_renderchain/d3d9_cg_renderchain.c b/gfx/drivers_renderchain/d3d9_cg_renderchain.c
index d0911203f3..2ea6c9c46f 100644
--- a/gfx/drivers_renderchain/d3d9_cg_renderchain.c
+++ b/gfx/drivers_renderchain/d3d9_cg_renderchain.c
@@ -303,7 +303,7 @@ static bool d3d9_cg_renderchain_init_shader_fvf(void *data, void *pass_data)
 
    for (count = 0; count < MAXD3DDECLLENGTH; count++)
    {
-      if (string_is_equal(&decl_end, &decl[count]))
+      if (string_is_equal_fast(&decl_end, &decl[count], sizeof(decl_end)))
          break;
    }