diff --git a/lib_arm/board.c b/lib_arm/board.c
index 9cffb4e..6f8c7fe 100644
--- a/lib_arm/board.c
+++ b/lib_arm/board.c
@@ -250,6 +250,9 @@
 #endif /* CONFIG_VFD */
 
 #ifdef CONFIG_LCD
+#	ifndef PAGE_SIZE
+#	  define PAGE_SIZE 4096
+#	endif
 	/*
 	 * reserve memory for LCD display (always full pages)
 	 */