diff --git a/lv_draw/lv_draw_img.c b/lv_draw/lv_draw_img.c
index e7ac7c73a..ad3309737 100644
--- a/lv_draw/lv_draw_img.c
+++ b/lv_draw/lv_draw_img.c
@@ -37,7 +37,9 @@ static const void * decoder_src;
 static lv_img_src_t decoder_src_type;
 static lv_img_header_t decoder_header;
 static const lv_style_t * decoder_style;
+#if USE_LV_FILESYSTEM
 static lv_fs_file_t decoder_file;
+#endif
 #if LV_IMG_CF_INDEXED
 static lv_color_t decoder_index_map[256];
 #endif
@@ -359,7 +361,6 @@ static const uint8_t * lv_img_decoder_open(const void * src, const lv_style_t *
     lv_res_t header_res;
     header_res = lv_img_dsc_get_info(src, &decoder_header);
     if(header_res == LV_RES_INV) {
-        lv_fs_close(&decoder_file);
         decoder_src = NULL;
         decoder_src_type = LV_IMG_SRC_UNKNOWN;
         LV_LOG_WARN("Built-in image decoder can't get the header info");
@@ -398,7 +399,10 @@ static const uint8_t * lv_img_decoder_open(const void * src, const lv_style_t *
               cf == LV_IMG_CF_INDEXED_8BIT) {
 
 #if LV_IMG_CF_INDEXED
+#if USE_LV_FILESYSTEM
         lv_color32_t palette_file[256];
+#endif
+
         lv_color32_t * palette_p = NULL;
         uint8_t px_size = lv_img_color_format_get_px_size(cf);
         uint32_t palette_size = 1 << px_size;
@@ -408,8 +412,6 @@ static const uint8_t * lv_img_decoder_open(const void * src, const lv_style_t *
             lv_fs_seek(&decoder_file, 4);   /*Skip the header*/
             lv_fs_read(&decoder_file, palette_file, palette_size * sizeof(lv_color32_t), NULL);
             palette_p = palette_file;
-#else
-            palette_file[0] = 0;       /*Just to solve warnings*/
 #endif
         } else {
             palette_p = (lv_color32_t *)((lv_img_dsc_t *)decoder_src)->data;
@@ -528,9 +530,11 @@ static void lv_img_decoder_close(void)
 
     /*It was opened with built-in decoder*/
     if(decoder_src) {
+#if USE_LV_FILESYSTEM
         if(decoder_src_type == LV_IMG_SRC_FILE) {
             lv_fs_close(&decoder_file);
         }
+#endif
         decoder_src_type = LV_IMG_SRC_UNKNOWN;
         decoder_src = NULL;
     }
diff --git a/lv_draw/lv_draw_line.c b/lv_draw/lv_draw_line.c
index bebef9b43..e5255ba05 100644
--- a/lv_draw/lv_draw_line.c
+++ b/lv_draw/lv_draw_line.c
@@ -225,7 +225,7 @@ static void line_draw_skew(line_draw_t * main_line, const lv_area_t * mask, cons
 #else
     lv_point_t pattern[LINE_MAX_WIDTH];
 #endif
-    int i = 0;
+    lv_coord_t i = 0;
 
     /*Create a perpendicular pattern (a small line)*/
     if(width != 0) {
@@ -235,7 +235,7 @@ static void line_draw_skew(line_draw_t * main_line, const lv_area_t * mask, cons
 
         uint32_t width_sqr = width * width;
         /* Run for a lot of times. Meanwhile the real width will be determined as well */
-        for(i = 0; i < (uint32_t)sizeof(pattern); i ++) {
+        for(i = 0; i < (lv_coord_t)sizeof(pattern); i ++) {
             pattern[i].x = pattern_line.p_act.x;
             pattern[i].y = pattern_line.p_act.y;
 
diff --git a/lv_objx/lv_img.h b/lv_objx/lv_img.h
index 24c5c27fd..c2e83c2cc 100644
--- a/lv_objx/lv_img.h
+++ b/lv_objx/lv_img.h
@@ -79,7 +79,8 @@ void lv_img_set_src(lv_obj_t * img, const void * src_img);
  */
 static inline void lv_img_set_file(lv_obj_t * img, const char * fn)
 {
-
+    (void) img;
+    (void) fn;
 }
 
 /**
@@ -107,7 +108,8 @@ static inline void lv_img_set_style(lv_obj_t *img, lv_style_t *style)
  */
 static inline void lv_img_set_upscale(lv_obj_t * img, bool upcale)
 {
-
+    (void) img;
+    (void) upcale;
 }
 
 /*=====================
@@ -152,6 +154,7 @@ static inline lv_style_t* lv_img_get_style(const lv_obj_t *img)
  */
 static inline bool lv_img_get_upscale(const lv_obj_t * img)
 {
+    (void)img;
     return false;
 }
 
diff --git a/lv_objx/lv_line.h b/lv_objx/lv_line.h
index 9ba153ce7..60365d463 100644
--- a/lv_objx/lv_line.h
+++ b/lv_objx/lv_line.h
@@ -100,7 +100,8 @@ static inline void lv_line_set_style(lv_obj_t *line, lv_style_t *style)
  */
 static inline void lv_line_set_upscale(lv_obj_t * line, bool upcale)
 {
-
+    (void) line;
+    (void) upcale;
 }
 /*=====================
  * Getter functions
@@ -137,6 +138,7 @@ static inline lv_style_t* lv_line_get_style(const lv_obj_t *line)
  */
 static inline bool lv_line_get_upscale(const lv_obj_t * line)
 {
+    (void) line;
     return false;
 }