diff --git a/rusty_v8.spec b/rusty_v8.spec
index b98212b..788c670 100644
--- a/rusty_v8.spec
+++ b/rusty_v8.spec
@@ -84,6 +84,8 @@ export GN_ARGS="clang_version=${CLANG_VERSION} use_lld=true enable_nacl = false
 export CFLAGS="%{optflags} -Wno-unknown-warning-option"
 export CXXFLAGS="%{optflags} -Wno-unknown-warning-option"
 export RUST_BACKTRACE=full
+mkdir -p third_party/rust-toolchain
+echo "system" > third_party/rust-toolchain/VERSION
 %{cargo_build}
 
 %install