diff --git a/extra/clang/sources b/extra/clang/sources
index 5eec6320..c26a683d 100644
--- a/extra/clang/sources
+++ b/extra/clang/sources
@@ -1,3 +1,3 @@
-http://releases.llvm.org/9.0.0/cfe-9.0.0.src.tar.xz
+https://releases.llvm.org/9.0.0/cfe-9.0.0.src.tar.xz
 patches/cfe-003-fix-unwind-chain-inclusion.patch
 patches/cfe-004-add-musl-triples.patch