diff --git a/desmume/src/addons/slot1_r4.cpp b/desmume/src/addons/slot1_r4.cpp
index cde22d53d..5ea041e02 100644
--- a/desmume/src/addons/slot1_r4.cpp
+++ b/desmume/src/addons/slot1_r4.cpp
@@ -26,7 +26,6 @@
 static FILE *img = NULL;
 static u32 write_count = 0;
 static u32 write_enabled = 0;
-static int old_addr = 0;
 static void init_r4_flash()
 {
 	srand(time(NULL));