diff --git a/configure.in b/configure.in
index 8cfff15..2b5ccee 100644
--- a/configure.in
+++ b/configure.in
@@ -237,8 +237,8 @@ AC_TYPE_SIGNAL
 AC_FUNC_VPRINTF
 AC_CHECK_FUNCS(
 	connect dlopen fcntl ftime getaddrinfo gethostname gethostbyname \
-	getnameinfo gettimeofday mkdir select socket snprintf stat strerror \
-	strstr snprintf vsnprintf
+	getnameinfo gettimeofday mkdir select socket stat strerror \
+	strstr snprintf vsnprintf _snprintf _vsnprintf
 )
 
 dnl Checks for stricmp/strcasecmp