diff --git a/src/boot/is_debug.c b/src/boot/is_debug.c
index 6d63118853..185ee77c62 100644
--- a/src/boot/is_debug.c
+++ b/src/boot/is_debug.c
@@ -1,6 +1,7 @@
 #include "is_debug.h"
 
 #include "ultra64.h"
+#include "versions.h"
 
 typedef struct ISVDbg {
     /* 0x00 */ u32 magic; // "IS64"