diff --git a/ci/check-syntax.sh b/ci/check-syntax.sh
index 069862f0e41..c5043ff512c 100755
--- a/ci/check-syntax.sh
+++ b/ci/check-syntax.sh
@@ -12,7 +12,7 @@ pushd "${WORKSPACE}/build"
 
 cmake -D CMAKE_BUILD_TYPE=Debug $CMAKE_FLAGS ../sources
 
-make re2_st # Generated headers
+make -j $THREADS re2_st # Generated headers
 
 jq --raw-output '.[] | .command' compile_commands.json | grep -v -P -- '-c .+/contrib/' | sed -r -e 's/-o\s+\S+/-fsyntax-only/' > syntax-commands
 xargs --arg-file=syntax-commands --max-procs=$THREADS --replace /bin/sh -c "{}"