diff --git a/apps/ts.c b/apps/ts.c
index 7edd5380e392b5034db042f97615fb398f2d2809..b8fb50b3b58d64533219b1e283f256668befe3fb 100644
--- a/apps/ts.c
+++ b/apps/ts.c
@@ -118,6 +118,7 @@ static X509_STORE *create_cert_store(char *ca_path, char *ca_file);
 static int MS_CALLBACK verify_cb(int ok, X509_STORE_CTX *ctx);
 
 /* Main function definition. */
+int MAIN(int, char **);
 
 int MAIN(int argc, char **argv)
 	{