diff --git a/src/lv_draw/lv_draw_img.c b/src/lv_draw/lv_draw_img.c
index 1a12fe4ce..4165e094f 100644
--- a/src/lv_draw/lv_draw_img.c
+++ b/src/lv_draw/lv_draw_img.c
@@ -419,8 +419,8 @@ LV_ATTRIBUTE_FAST_MEM static void lv_draw_map(const lv_area_t * map_area, const
                 return;
             }
 #endif
-            lv_coord_t hor_res_max = lv_disp_get_hor_res(disp);
-            uint32_t mask_buf_size = lv_area_get_size(&draw_area) > hor_res_max ? hor_res_max : lv_area_get_size(&draw_area);
+            uint32_t hor_res = (uint32_t) lv_disp_get_hor_res(disp);
+            uint32_t mask_buf_size = lv_area_get_size(&draw_area) > (uint32_t) hor_res ? hor_res : lv_area_get_size(&draw_area);
             lv_color_t * map2 = _lv_mem_buf_get(mask_buf_size * sizeof(lv_color_t));
             lv_opa_t * mask_buf = _lv_mem_buf_get(mask_buf_size);
 
@@ -470,8 +470,8 @@ LV_ATTRIBUTE_FAST_MEM static void lv_draw_map(const lv_area_t * map_area, const
         /*Most complicated case: transform or other mask or chroma keyed*/
         else {
             /*Build the image and a mask line-by-line*/
-            lv_coord_t hor_res_max = lv_disp_get_hor_res(disp);
-            uint32_t mask_buf_size = lv_area_get_size(&draw_area) > hor_res_max ? hor_res_max : lv_area_get_size(&draw_area);
+            uint32_t hor_res = (uint32_t) lv_disp_get_hor_res(disp);
+            uint32_t mask_buf_size = lv_area_get_size(&draw_area) > hor_res ? hor_res : lv_area_get_size(&draw_area);
             lv_color_t * map2 = _lv_mem_buf_get(mask_buf_size * sizeof(lv_color_t));
             lv_opa_t * mask_buf = _lv_mem_buf_get(mask_buf_size);
 
diff --git a/src/lv_draw/lv_draw_line.c b/src/lv_draw/lv_draw_line.c
index b3c385d2f..1ae458f3f 100644
--- a/src/lv_draw/lv_draw_line.c
+++ b/src/lv_draw/lv_draw_line.c
@@ -424,7 +424,7 @@ LV_ATTRIBUTE_FAST_MEM static void draw_line_skew(const lv_point_t * point1, cons
 
     /*Draw the background line by line*/
     int32_t h;
-    lv_coord_t hor_res = lv_disp_get_hor_res(disp);
+    uint32_t hor_res = (uint32_t)lv_disp_get_hor_res(disp);
     size_t mask_buf_size = LV_MATH_MIN(lv_area_get_size(&draw_area), hor_res);
     lv_opa_t * mask_buf = _lv_mem_buf_get(mask_buf_size);