1 files changed, 5 insertions, 0 deletions

diff --git a/firmware/common/sprintf.c b/firmware/common/sprintf.c
index 0f012f7340..6c1855e06b 100644
--- a/firmware/common/sprintf.c
+++ b/firmware/common/sprintf.c
@@ -292,3 +292,8 @@ int fdprintf(int fd, const char *fmt, ...)
     return fpr.bytes; /* return 0 on error */
 }
 
+int vfnprintf(int (*push)(void *userp, unsigned char data), void *userp, const char *fmt, va_list ap)
+{
+    return format(push, userp, fmt, ap);
+}
+