diff --git a/test/ci-make b/test/ci-make
index efe4203..a232172 100755
--- a/test/ci-make
+++ b/test/ci-make
@@ -10,7 +10,7 @@ usage() {
     exit 1
 }
 
-if [ $# -eq 0 ] || [ "$1" = -h -o "$1" = --help ]; then
+if [ $# -eq 0 ] || [ "$1" = -h ] || [ "$1" = --help ]; then
    usage
 fi
 
@@ -26,21 +26,27 @@ run() {
     fi
 }
 
-tmpfiles=()
+tmpdir=$(mktemp -d)
+# Leak the files in tmpdir on purpose so that they can be examined.
+echo "ci-make writing to $tmpdir"
 
+i=0
 for target in "${targets[@]}"; do
-    tmp=$(mktemp)
-    tmpfiles+=("$tmp")
+    tmp="$tmpdir/$i"
+    i=$(( i + 1 ))
     ( run "$target" 2>&1 | test/target/debug/log-timestamp > "$tmp" ) &
 done
 
-for target in "${targets[@]}"; do
+for _target in "${targets[@]}"; do
     wait || true
 done
 
 exit_code=0
 
-for tmp in "${tmpfiles[@]}"; do
+i=0
+for _target in "${targets[@]}"; do
+    tmp="$tmpdir/$i"
+    i=$(( i + 1 ))
     echo "========================================================================================"
     if tail -1 "$tmp" | grep -q ": Ok."; then
         if [ "${CI_MAKE_VERBOSE-}" == 1 ]; then