diff --git a/scripts/scons_helpers/build-3rdparty.py b/scripts/scons_helpers/build-3rdparty.py
index 16ecf9b61..3859291b4 100644
--- a/scripts/scons_helpers/build-3rdparty.py
+++ b/scripts/scons_helpers/build-3rdparty.py
@@ -1489,7 +1489,7 @@ def die(text, *args):
     elif ctx.pkg_name == 'ltdl':
         download(
             ctx,
-            'https://ftp.gnu.org/gnu/libtool/libtool-{ctx.pkg_ver}.tar.gz',
+            'https://ftpmirror.gnu.org/libtool/libtool-{ctx.pkg_ver}.tar.gz',
             'libtool-{ctx.pkg_ver}.tar.gz')
         unpack(
             ctx,
@@ -1542,7 +1542,7 @@ def die(text, *args):
         native_compilers = detect_native_cc_cxx_compilers();
         download(
             ctx,
-            'https://ftp.gnu.org/gnu/gengetopt/gengetopt-{ctx.pkg_ver}.tar.gz',
+            'https://ftpmirror.gnu.org/gnu/gengetopt/gengetopt-{ctx.pkg_ver}.tar.gz',
             'gengetopt-{ctx.pkg_ver}.tar.gz')
         unpack(
             ctx,