diff --git a/uisimulator/common/lcd-common.c b/uisimulator/common/lcd-common.c
index f9b374cf81..bf9cb5c269 100644
--- a/uisimulator/common/lcd-common.c
+++ b/uisimulator/common/lcd-common.c
@@ -50,6 +50,10 @@ int lcd_default_contrast(void)
     return 28;
 }
 
+void lcd_sleep(void)
+{
+}
+
 #ifdef HAVE_REMOTE_LCD
 void lcd_remote_set_contrast(int val)
 {