diff --git a/src/draw/sw/lv_draw_sw_letter.c b/src/draw/sw/lv_draw_sw_letter.c
index 802fb9c90..6dd19761d 100644
--- a/src/draw/sw/lv_draw_sw_letter.c
+++ b/src/draw/sw/lv_draw_sw_letter.c
@@ -441,7 +441,7 @@ static void draw_letter_subpx(lv_draw_ctx_t * draw_ctx, const lv_draw_label_dsc_
 #endif
 
     lv_draw_sw_blend_dsc_t blend_dsc;
-    lv_memset_00(&blend_dsc, sizeof(&blend_dsc));
+    lv_memset_00(&blend_dsc, sizeof(blend_dsc));
     blend_dsc.blend_area = &map_area;
     blend_dsc.mask_area = &map_area;
     blend_dsc.src_buf = color_buf;