diff --git a/firmware/drivers/lcd.c b/firmware/drivers/lcd.c
index 6df3f28ffd..66b1c682e7 100644
--- a/firmware/drivers/lcd.c
+++ b/firmware/drivers/lcd.c
@@ -325,6 +325,7 @@ static const unsigned char lcd_ascii[] = {
 };
 #endif /* HAVE_NEW_CHARCELL_LCD */
 
+#ifndef SIMULATOR
 void lcd_clear_display(void)
 {
     int i;
@@ -347,8 +348,14 @@ void lcd_define_pattern (int which,char *pattern,int length)
     for (i=0;i<length;i++)
 	lcd_write(FALSE,pattern[i]);
 }
+#endif
 
-#elif HAVE_LCD_BITMAP /* not CHARCELLS */
+#endif
+#if defined(HAVE_LCD_BITMAP) || defined(SIMULATOR) /* not CHARCELLS */
+
+#if defined(HAVE_LCD_CHARCELLS) && defined(SIMULATOR)
+#include <chardef.h>
+#endif
 
 /*
  * All bitmaps have this format:
@@ -681,6 +688,10 @@ void lcd_fontsize(char font, char *width, char *height)
     }
 }
 
+#if defined(HAVE_LCD_CHARCELLS) && defined(SIMULATOR)
+#include <charundef.h>
+#endif
+
 #else
 /* no LCD defined, no code to use */
 #endif
diff --git a/firmware/drivers/lcd.h b/firmware/drivers/lcd.h
index 7e0495cd99..21da38188a 100644
--- a/firmware/drivers/lcd.h
+++ b/firmware/drivers/lcd.h
@@ -63,7 +63,12 @@ extern void lcd_backlight(bool on);
 extern void lcd_puts(int x, int y, char *string);
 extern void lcd_define_pattern (int which,char *pattern,int length);
 
-#elif HAVE_LCD_BITMAP
+#endif
+#if defined(HAVE_LCD_BITMAP) || defined(SIMULATOR)
+
+#if defined(HAVE_LCD_CHARCELLS) && defined(SIMULATOR)
+#include <chardef.h>
+#endif
 
 #define LCD_WIDTH       112   /* Display width in pixels */
 #define LCD_HEIGHT      64    /* Display height in pixels */
@@ -82,6 +87,10 @@ extern void lcd_clearpixel(int x, int y);
 
 void lcd_fontsize(char font, char *width, char *height);
 
+#if defined(HAVE_LCD_CHARCELLS) && defined(SIMULATOR)
+#include <charundef.h>
+#endif
+
 #endif /* CHARCELLS / BITMAP */
 
 #endif /* __LCD_H__ */