diff --git a/Firmware/menu.cpp b/Firmware/menu.cpp
index b63629edf..7fa177460 100644
--- a/Firmware/menu.cpp
+++ b/Firmware/menu.cpp
@@ -14,10 +14,14 @@
 
 extern int32_t lcd_encoder;
 
+#define MENU_DEPTH_MAX       4
 
-menu_record_t menu_stack[MENU_DEPTH_MAX];
+static menu_record_t menu_stack[MENU_DEPTH_MAX];
 
 uint8_t menu_data[MENU_DATA_SIZE];
+#ifndef __AVR__
+#error "menu_data is non-portable to non 8bit processor"
+#endif
 
 uint8_t menu_depth = 0;
 
@@ -33,6 +37,8 @@ uint8_t menu_leaving = 0;
 
 menu_func_t menu_menu = 0;
 
+static_assert(sizeof(menu_data)>= sizeof(menu_data_edit_t),"menu_data_edit_t doesn't fit into menu_data");
+
 
 void menu_goto(menu_func_t menu, const uint32_t encoder, const bool feedback, bool reset_menu_state)
 {
@@ -296,15 +302,6 @@ void menu_draw_float13(char chr, const char* str, float val)
 	lcd_printf_P(menu_fmt_float13, chr, str, spaces, val);
 }
 
-typedef struct
-{
-    //Variables used when editing values.
-    const char* editLabel;
-    void* editValue;
-    int32_t minEditValue;
-	int32_t maxEditValue;
-} menu_data_edit_t;
-
 void _menu_edit_int3(void)
 {
 	menu_data_edit_t* _md = (menu_data_edit_t*)&(menu_data[0]);
diff --git a/Firmware/menu.h b/Firmware/menu.h
index 06c901035..af6f38969 100644
--- a/Firmware/menu.h
+++ b/Firmware/menu.h
@@ -4,9 +4,7 @@
 
 #include <inttypes.h>
 
-#define MENU_DEPTH_MAX       4
 #define MENU_DATA_SIZE      32
-#define MENU_DATA_EDIT_SIZE 12
 
 //Function pointer to menu functions.
 typedef void (*menu_func_t)(void);
@@ -17,7 +15,14 @@ typedef struct
     int8_t position;
 } menu_record_t;
 
-extern menu_record_t menu_stack[MENU_DEPTH_MAX];
+typedef struct
+{
+    //Variables used when editing values.
+    const char* editLabel;
+    void* editValue;
+    int32_t minEditValue;
+    int32_t maxEditValue;
+} menu_data_edit_t;
 
 extern uint8_t menu_data[MENU_DATA_SIZE];
 
diff --git a/Firmware/ultralcd.cpp b/Firmware/ultralcd.cpp
index ee81f5a6b..b447f428f 100644
--- a/Firmware/ultralcd.cpp
+++ b/Firmware/ultralcd.cpp
@@ -2090,9 +2090,7 @@ static void lcd_support_menu()
 		uint8_t ip[4];                 // 4bytes
 		char ip_str[3*4+3+1];          // 16bytes
 	} _menu_data_t;
-#if (22 > MENU_DATA_SIZE)
-#error "check MENU_DATA_SIZE definition!"
-#endif
+    static_assert(sizeof(menu_data)>= sizeof(_menu_data_t),"_menu_data_t doesn't fit into menu_data");
 	_menu_data_t* _md = (_menu_data_t*)&(menu_data[0]);
     if (_md->status == 0 || lcd_draw_update == 2)
 	{
@@ -2421,6 +2419,7 @@ static void lcd_menu_AutoLoadFilament()
     }
     else
     {
+        static_assert(sizeof(menu_data)>=sizeof(ShortTimer), "ShortTimer doesn't fit into menu_data");
 		ShortTimer* ptimer = (ShortTimer*)&(menu_data[0]);
         if (!ptimer->running()) ptimer->start();
         lcd_set_cursor(0, 0);
@@ -2537,9 +2536,7 @@ static void _lcd_move(const char *name, int axis, int min, int max)
 		bool initialized;              // 1byte
 		bool endstopsEnabledPrevious;  // 1byte
 	} _menu_data_t;
-#if (2 > MENU_DATA_SIZE)
-#error "check MENU_DATA_SIZE definition!"
-#endif
+	static_assert(sizeof(menu_data)>= sizeof(_menu_data_t),"_menu_data_t doesn't fit into menu_data");
 	_menu_data_t* _md = (_menu_data_t*)&(menu_data[0]);
 	if (!_md->initialized)
 	{
@@ -2743,9 +2740,7 @@ static void _lcd_babystep(int axis, const char *msg)
 		int babystepMem[3];            // 6bytes
 		float babystepMemMM[3];        // 12bytes
 	} _menu_data_t;
-#if (19 > MENU_DATA_SIZE)
-#error "check MENU_DATA_SIZE definition!"
-#endif
+	static_assert(sizeof(menu_data)>= sizeof(_menu_data_t),"_menu_data_t doesn't fit into menu_data");
 	_menu_data_t* _md = (_menu_data_t*)&(menu_data[0]);
 	if (_md->status == 0)
 	{
@@ -2826,16 +2821,14 @@ static void lcd_babystep_z()
 
 typedef struct
 {	// 12bytes + 9bytes = 21bytes total
-	uint8_t reserved[MENU_DATA_EDIT_SIZE]; //12 bytes reserved for number editing functions
+    menu_data_edit_t reserved; //12 bytes reserved for number editing functions
 	int8_t status;                   // 1byte
 	int16_t left;                    // 2byte
 	int16_t right;                   // 2byte
 	int16_t front;                   // 2byte
 	int16_t rear;                    // 2byte
 } _menu_data_adjust_bed_t;
-#if (21 > MENU_DATA_SIZE)
-#error "check MENU_DATA_SIZE definition!"
-#endif
+static_assert(sizeof(menu_data)>= sizeof(_menu_data_adjust_bed_t),"_menu_data_adjust_bed_t doesn't fit into menu_data");
 
 void lcd_adjust_bed_reset(void)
 {
@@ -5671,16 +5664,14 @@ static void lcd_colorprint_change() {
 static void lcd_tune_menu()
 {
 	typedef struct
-	{	// 3bytes total
-		// To recognize, whether the menu has been just initialized.
-		int8_t  status;                                 // 1byte
-		// Backup of extrudemultiply, to recognize, that the value has been changed and
-		// it needs to be applied.
-		int16_t extrudemultiply;                        // 2byte
+	{
+	    menu_data_edit_t reserved; //!< reserved for number editing functions
+		int8_t  status; //!< To recognize, whether the menu has been just initialized.
+		//! Backup of extrudemultiply, to recognize, that the value has been changed and
+		//! it needs to be applied.
+		int16_t extrudemultiply;
 	} _menu_data_t;
-#if (3 > MENU_DATA_SIZE)
-#error "check MENU_DATA_SIZE definition!"
-#endif
+	static_assert(sizeof(menu_data)>= sizeof(_menu_data_t),"_menu_data_t doesn't fit into menu_data");
 	_menu_data_t* _md = (_menu_data_t*)&(menu_data[0]);
 	if (_md->status == 0)
 	{