diff --git a/build/build.sh b/build/build.sh
index 7093acf..61582a5 100755
--- a/build/build.sh
+++ b/build/build.sh
@@ -67,6 +67,7 @@ widberg-main)
     URL=https://github.com/widberg/llvm-project-widberg-extensions.git
     VERSION=widberg-main-$(date +%Y%m%d)
     CMAKE_EXTRA_ARGS+=("-DCMAKE_BUILD_TYPE=RelWithDebInfo" "-DLLVM_ENABLE_ASSERTIONS=ON" "-DLLVM_TARGETS_TO_BUILD=X86")
+    LLVM_ENABLE_RUNTIMES+=";libunwind"
     ;;
 mizvekov-resugar)
     BRANCH=resugar