diff --git a/sci-mathematics/calc/calc-2.12.7.2.recipe b/sci-mathematics/calc/calc-2.12.7.2.recipe
index 0fde4a59b..ab6d412b5 100644
--- a/sci-mathematics/calc/calc-2.12.7.2.recipe
+++ b/sci-mathematics/calc/calc-2.12.7.2.recipe
@@ -10,7 +10,7 @@ HOMEPAGE="http://www.isthe.com/chongo/tech/comp/calc/"
 COPYRIGHT="1999-2017 Landon Curt Noll"
 LICENSE="GNU LGPL v2.1"
 REVISION="1"
-SOURCE_URI="http://www.isthe.com/chongo/src/calc/calc-$portVersion.tar.bz2"
+SOURCE_URI="https://github.com/lcn2/calc/releases/download/$portVersion/calc-$portVersion.tar.bz2"
 CHECKSUM_SHA256="57af44181ca3af7348c82ee628cfd221677a09fef11a29d2e5667726d5aafc90"
 PATCHES="calc-$portVersion.patchset"