diff --git a/utils/buildit/build_llvm b/utils/buildit/build_llvm
index 0ffbc190d39..5aa3c2cf683 100755
--- a/utils/buildit/build_llvm
+++ b/utils/buildit/build_llvm
@@ -156,6 +156,7 @@ make $JOBS_FLAG $OPTIMIZE_OPTS UNIVERSAL=1 UNIVERSAL_ARCH="$HOSTS" \
     UNIVERSAL_SDK_PATH=$SDKROOT \
     NO_RUNTIME_LIBS=1 \
     DISABLE_EDIS=1 \
+    REQUIRES_RTTI=1 \
     DEBUG_SYMBOLS=1 \
     LLVM_SUBMIT_VERSION=$LLVM_SUBMIT_VERSION \
     LLVM_SUBMIT_SUBVERSION=$LLVM_SUBMIT_SUBVERSION \