diff --git a/tools/isl/Makefile b/tools/isl/Makefile
index c1000e1e31..de9051651c 100644
--- a/tools/isl/Makefile
+++ b/tools/isl/Makefile
@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 PKG_NAME:=isl
 PKG_VERSION:=0.20
 
-PKG_SOURCE_URL:=http://isl.gforge.inria.fr
+PKG_SOURCE_URL:=https://libisl.sourceforge.io/
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
 PKG_HASH:=a5596a9fb8a5b365cb612e4b9628735d6e67e9178fae134a816ae195017e77aa