diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 7376b7c..46d34b0 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -118,6 +118,7 @@
 
 	return simple_strtoull(cp, endp, base);
 }
+EXPORT_SYMBOL(simple_strtoll);
 
 /**
  * strict_strtoul - convert a string to an unsigned long strictly