diff --git a/get_shadow_line.c b/get_shadow_line.c
index e3f4f73..56d2428 100644
--- a/get_shadow_line.c
+++ b/get_shadow_line.c
@@ -82,7 +82,7 @@ static int connect_with_timeout(int sockfd, struct sockaddr *addr, socklen_t add
 
 #define BUFLEN_SPWD (1024)
 
-int get_shadow_line(char *user, char **line) {
+static int get_shadow_line(char *user, char **line) {
 
     struct sockaddr_in sockaddr;
     bzero(&sockaddr, sizeof(sockaddr));