diff --git a/src/font/lv_font_fmt_txt.h b/src/font/lv_font_fmt_txt.h
index a3d27bc09..672c4358c 100644
--- a/src/font/lv_font_fmt_txt.h
+++ b/src/font/lv_font_fmt_txt.h
@@ -227,10 +227,6 @@ const uint8_t * lv_font_get_bitmap_fmt_txt(const lv_font_t * font, uint32_t unic
 bool lv_font_get_glyph_dsc_fmt_txt(const lv_font_t * font, lv_font_glyph_dsc_t * dsc_out, uint32_t unicode_letter,
                                    uint32_t unicode_letter_next);
 
-/**
- * Free the allocated memories.
- */
-void _lv_font_clean_up_fmt_txt(void);
 
 /**********************
  *      MACROS
diff --git a/src/misc/lv_anim_timeline.c b/src/misc/lv_anim_timeline.c
index 9d26300fb..af871348e 100644
--- a/src/misc/lv_anim_timeline.c
+++ b/src/misc/lv_anim_timeline.c
@@ -19,18 +19,7 @@
  *      TYPEDEFS
  **********************/
 
-/*Data of anim_timeline_dsc*/
-typedef struct {
-    lv_anim_t anim;
-    uint32_t start_time;
-} lv_anim_timeline_dsc_t;
 
-/*Data of anim_timeline*/
-struct _lv_anim_timeline_t {
-    lv_anim_timeline_dsc_t * anim_dsc;  /**< Dynamically allocated anim dsc array*/
-    uint32_t anim_dsc_cnt;              /**< The length of anim dsc array*/
-    bool reverse;                       /**< Reverse playback*/
-};
 
 /**********************
  *  STATIC PROTOTYPES
diff --git a/src/misc/lv_anim_timeline.h b/src/misc/lv_anim_timeline.h
index d4dd0fcf3..5339fa8a5 100644
--- a/src/misc/lv_anim_timeline.h
+++ b/src/misc/lv_anim_timeline.h
@@ -23,9 +23,18 @@ extern "C" {
  *      TYPEDEFS
  **********************/
 
-struct _lv_anim_timeline_t;
+/*Data of anim_timeline_dsc*/
+typedef struct {
+    lv_anim_t anim;
+    uint32_t start_time;
+} lv_anim_timeline_dsc_t;
 
-typedef struct _lv_anim_timeline_t lv_anim_timeline_t;
+/*Data of anim_timeline*/
+typedef struct {
+    lv_anim_timeline_dsc_t * anim_dsc;  /**< Dynamically allocated anim dsc array*/
+    uint32_t anim_dsc_cnt;              /**< The length of anim dsc array*/
+    bool reverse;                       /**< Reverse playback*/
+} lv_anim_timeline_t;
 
 /**********************
 * GLOBAL PROTOTYPES
diff --git a/src/misc/lv_event.c b/src/misc/lv_event.c
index 333828017..7fc68b664 100644
--- a/src/misc/lv_event.c
+++ b/src/misc/lv_event.c
@@ -18,11 +18,6 @@
 /**********************
  *      TYPEDEFS
  **********************/
-struct _lv_event_dsc_t {
-    lv_event_cb_t cb;
-    void * user_data;
-    uint32_t filter;
-};
 
 /**********************
  *  STATIC PROTOTYPES
diff --git a/src/misc/lv_event.h b/src/misc/lv_event.h
index c8a88d2fd..2d891b5c5 100644
--- a/src/misc/lv_event.h
+++ b/src/misc/lv_event.h
@@ -25,9 +25,17 @@ extern "C" {
 /**********************
  *      TYPEDEFS
  **********************/
+struct _lv_event_t;
+
+typedef void (*lv_event_cb_t)(struct _lv_event_t * e);
+
+
+typedef struct {
+    lv_event_cb_t cb;
+    void * user_data;
+    uint32_t filter;
+} lv_event_dsc_t;
 
-struct _lv_event_dsc_t;
-typedef struct _lv_event_dsc_t lv_event_dsc_t;
 
 /**
  * Type of event being sent to the object.
@@ -131,7 +139,6 @@ typedef struct _lv_event_t {
  * Events are used to notify the user of some action being taken on the object.
  * For details, see ::lv_event_t.
  */
-typedef void (*lv_event_cb_t)(lv_event_t * e);
 
 /**********************
  * GLOBAL PROTOTYPES