diff --git a/embed/unix/flash.c b/embed/unix/flash.c
index 3daa2e39b3..2790660d63 100644
--- a/embed/unix/flash.c
+++ b/embed/unix/flash.c
@@ -66,6 +66,7 @@ static void flash_read(void)
 
 int flash_init(void)
 {
+    memset(flash_buffer, 0xFF, sizeof(flash_buffer));
     flash_read();
     return 0;
 }