diff --git a/configure.ac b/configure.ac
index 5cf194d10e9e9f1921b5bb3d9c2313f02e9f0be1..6142c4b22a82cae3a61d0b6af4666f7a03174da8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -475,7 +475,7 @@ fi
 # Checks for libraries
 AC_CHECK_LIB(gmp, __gmpz_getlimbn,,
     [AC_MSG_WARN(
-[GNU MP not found, or not 3.1 or up, see http://www.swox.com/gmp.
+[GNU MP not found, or not 3.1 or up, see http://gmplib.org/.
 Support for public key algorithms will be unavailable.])]
     enable_public_key=no)