diff --git a/main/snprintf.c b/main/snprintf.c
index caaf3b78c04..ff806f78a2d 100644
--- a/main/snprintf.c
+++ b/main/snprintf.c
@@ -897,6 +897,7 @@ static int format_converter(register buffy * odp, const char *fmt,
 
 
 				case 's':
+				case 'v':
 					s = va_arg(ap, char *);
 					if (s != NULL) {
 						s_len = strlen(s);
diff --git a/main/spprintf.c b/main/spprintf.c
index 67375aee96b..96a0234fc0e 100644
--- a/main/spprintf.c
+++ b/main/spprintf.c
@@ -513,6 +513,7 @@ static void xbuf_format_converter(smart_str *xbuf, const char *fmt, va_list ap)
 
 
 				case 's':
+				case 'v':
 					s = va_arg(ap, char *);
 					if (s != NULL) {
 						s_len = strlen(s);