diff --git a/docs/examples/.checksrc b/docs/examples/.checksrc
index 59899762bf..c81d159768 100644
--- a/docs/examples/.checksrc
+++ b/docs/examples/.checksrc
@@ -10,6 +10,7 @@ allowfunc snprintf
 allowfunc socket
 allowfunc sscanf
 allowfunc strerror
+allowfunc vsnprintf
 banfunc curl_maprintf
 banfunc curl_mfprintf
 banfunc curl_mprintf