diff --git a/cibw_before_all.sh b/cibw_before_all.sh
index 6e234e5..d93b076 100644
--- a/cibw_before_all.sh
+++ b/cibw_before_all.sh
@@ -20,7 +20,7 @@ if command -v apt; then
 elif command -v apk; then
     apk update && apk add clang-dev
 elif command -v yum; then
-    yum -y install centos-release-scl llvm-toolset-7.0
+    yum -y install centos-release-scl llvm-toolset-7.0 llvm-toolset-7.0-llvm-devel
     source scl_source enable llvm-toolset-7.0 || true
     ln -s `which clang` /usr/local/bin/clang
     ln -s `which clang-7` /usr/local/bin/clang-7