diff --git a/projects/gnu.org/autoconf/package.yml b/projects/gnu.org/autoconf/package.yml
index af5ba492..e7771f0b 100644
--- a/projects/gnu.org/autoconf/package.yml
+++ b/projects/gnu.org/autoconf/package.yml
@@ -54,6 +54,8 @@ build:
 test:
   dependencies:
     llvm.org: '*' # requires a C compiler to configure
+  env:
+    CC: clang
   script:
     - autoconf --verbose --debug
     - ./configure