diff --git a/src/lv_font/lv_font.h b/src/lv_font/lv_font.h
index e639a54a3..557f81cc3 100644
--- a/src/lv_font/lv_font.h
+++ b/src/lv_font/lv_font.h
@@ -65,7 +65,7 @@ typedef struct _lv_font_struct
     /*Pointer to the font in a font pack (must have the same line height)*/
     uint8_t line_height;      /**< The real line height where any text fits*/
     uint8_t base_line;        /**< Base line measured from the top of the line_height*/
-    void * dsc;               /**< Store implementation specific data here*/
+    const void * dsc;               /**< Store implementation specific data here*/
 #if LV_USE_USER_DATA
     lv_font_user_data_t user_data; /**< Custom user data for font. */
 #endif
diff --git a/src/lv_font/lv_font_roboto_12.c b/src/lv_font/lv_font_roboto_12.c
index 6c637d7a3..456f89c8b 100644
--- a/src/lv_font/lv_font_roboto_12.c
+++ b/src/lv_font/lv_font_roboto_12.c
@@ -1677,7 +1677,7 @@ static const lv_font_fmt_txt_kern_pair_t kern_pairs =
  *--------------------*/
 
 /*Store all the custom data of the font*/
-static lv_font_fmt_txt_dsc_t font_dsc = {
+static const lv_font_fmt_txt_dsc_t font_dsc = {
     .glyph_bitmap = gylph_bitmap,
     .glyph_dsc = glyph_dsc,
     .cmaps = cmaps,
diff --git a/src/lv_font/lv_font_roboto_16.c b/src/lv_font/lv_font_roboto_16.c
index 2f9c0b1cc..07d5ecaf9 100644
--- a/src/lv_font/lv_font_roboto_16.c
+++ b/src/lv_font/lv_font_roboto_16.c
@@ -2117,7 +2117,7 @@ static const lv_font_fmt_txt_kern_pair_t kern_pairs =
  *--------------------*/
 
 /*Store all the custom data of the font*/
-static lv_font_fmt_txt_dsc_t font_dsc = {
+static const lv_font_fmt_txt_dsc_t font_dsc = {
     .glyph_bitmap = gylph_bitmap,
     .glyph_dsc = glyph_dsc,
     .cmaps = cmaps,
diff --git a/src/lv_font/lv_font_roboto_22.c b/src/lv_font/lv_font_roboto_22.c
index 61e0fec00..958826da8 100644
--- a/src/lv_font/lv_font_roboto_22.c
+++ b/src/lv_font/lv_font_roboto_22.c
@@ -2993,7 +2993,7 @@ static const lv_font_fmt_txt_kern_pair_t kern_pairs =
  *--------------------*/
 
 /*Store all the custom data of the font*/
-static lv_font_fmt_txt_dsc_t font_dsc = {
+static const lv_font_fmt_txt_dsc_t font_dsc = {
     .glyph_bitmap = gylph_bitmap,
     .glyph_dsc = glyph_dsc,
     .cmaps = cmaps,
diff --git a/src/lv_font/lv_font_roboto_28.c b/src/lv_font/lv_font_roboto_28.c
index 8432a6fd4..ecfba1900 100644
--- a/src/lv_font/lv_font_roboto_28.c
+++ b/src/lv_font/lv_font_roboto_28.c
@@ -4068,7 +4068,7 @@ static const lv_font_fmt_txt_kern_pair_t kern_pairs =
  *--------------------*/
 
 /*Store all the custom data of the font*/
-static lv_font_fmt_txt_dsc_t font_dsc = {
+static const lv_font_fmt_txt_dsc_t font_dsc = {
     .glyph_bitmap = gylph_bitmap,
     .glyph_dsc = glyph_dsc,
     .cmaps = cmaps,
diff --git a/src/lv_font/lv_font_unscii_8.c b/src/lv_font/lv_font_unscii_8.c
index e86727cf9..6391cfca6 100644
--- a/src/lv_font/lv_font_unscii_8.c
+++ b/src/lv_font/lv_font_unscii_8.c
@@ -433,7 +433,7 @@ static const lv_font_fmt_txt_cmap_t cmaps[] =
  *--------------------*/
 
 /*Store all the custom data of the font*/
-static lv_font_fmt_txt_dsc_t font_dsc = {
+static const lv_font_fmt_txt_dsc_t font_dsc = {
     .glyph_bitmap = gylph_bitmap,
     .glyph_dsc = glyph_dsc,
     .cmaps = cmaps,