diff --git a/npa/configure.ac b/npa/configure.ac
index 508fd47..532a076 100644
--- a/npa/configure.ac
+++ b/npa/configure.ac
@@ -47,7 +47,7 @@ CPPFLAGS="$CPPFLAGS $OPENSSL_CFLAGS"
 LIBS="$LDFLAGS $OPENSC_LIBS $OPENSSL_LIBS"
 AC_MSG_CHECKING([for sc_perform_pace])
 AC_TRY_LINK_FUNC(sc_perform_pace, [ AC_MSG_RESULT([yes]) ],
-        [ AC_MSG_ERROR([libopensc with PACE (https://github.com/frankmorgner/OpenSC) not found, use ./configure OPENSC_LIBS=...]) ])
+        [ AC_MSG_ERROR([libopensc with PACE (git clone git://github.com/frankmorgner/OpenSC.git) not found, use ./configure OPENSC_LIBS=...]) ])
 
 AC_CHECK_HEADERS(openssl/evp.h, [], [ AC_MSG_ERROR([openssl/evp.h not found, install OpenSSL or use ./configure OPENSSL_CFLAGS=...]) ])
 AC_MSG_CHECKING([for EVP_read_pw_string_min])