diff --git a/fido2/version.c b/fido2/version.c
index f2d39f0a..ee8aac6d 100644
--- a/fido2/version.c
+++ b/fido2/version.c
@@ -1,4 +1,5 @@
 #include "version.h"
+#include "app.h"
 
 const version_t firmware_version 
 #ifdef SOLO