diff --git a/ext/test/custom-exit-behavior b/ext/test/custom-exit-behavior
index 7669c6e..7bbe628 100755
--- a/ext/test/custom-exit-behavior
+++ b/ext/test/custom-exit-behavior
@@ -4,7 +4,6 @@ set -uexo pipefail
 
 usage() { echo "Usage: $(basename "$0")"; }
 misuse() { usage 1>&2; exit 2; }
-tk() { lein trampoline run "$@"; }
 
 test $# -eq 0 || misuse
 
@@ -13,8 +12,9 @@ tmpdir="$(cd "$tmpdir" && pwd)"
 trap "$(printf 'rm -rf %q' "$tmpdir")" EXIT
 
 rc=0
-tk -d -b <(echo puppetlabs.trapperkeeper.custom-exit-behavior-test/custom-exit-behavior-test-service) \
-   1>"$tmpdir/out" 2>"$tmpdir/err" || rc=$?
+./tk -cp "$(pwd)/test" -- \
+     -d -b <(echo puppetlabs.trapperkeeper.custom-exit-behavior-test/custom-exit-behavior-test-service) \
+     1>"$tmpdir/out" 2>"$tmpdir/err" || rc=$?
 cat "$tmpdir/out" "$tmpdir/err"
 test "$rc" -eq 7
 grep -F 'Some excitement!' "$tmpdir/out"
diff --git a/ext/test/top-level-cli b/ext/test/top-level-cli
index 030a89b..d0e436e 100755
--- a/ext/test/top-level-cli
+++ b/ext/test/top-level-cli
@@ -14,7 +14,7 @@ trap "$(printf 'rm -rf %q' "$tmpdir")" EXIT
 
 ## Test handling an unknown option
 rc=0
-./tk --invalid-option 1>"$tmpdir/out" 2>"$tmpdir/err" || rc=$?
+./tk -- --invalid-option 1>"$tmpdir/out" 2>"$tmpdir/err" || rc=$?
 cat "$tmpdir/out" "$tmpdir/err"
 test "$rc" -eq 1
 grep -F 'Unknown option: "--invalid-option"' "$tmpdir/err"
@@ -22,7 +22,7 @@ grep -F 'Unknown option: "--invalid-option"' "$tmpdir/err"
 
 ## Test --help
 rc=0
-./tk --help  1>"$tmpdir/out" 2>"$tmpdir/err" || rc=$?
+./tk -- --help  1>"$tmpdir/out" 2>"$tmpdir/err" || rc=$?
 cat "$tmpdir/out" "$tmpdir/err"
 test "$rc" -eq 0
 grep -F 'Path to bootstrap config file' "$tmpdir/out"
@@ -32,7 +32,7 @@ test $(wc -c < "$tmpdir/out") -eq 650
 
 ## Test handling a missing bootstrap file
 rc=0
-./tk frobnicate ... 1>"$tmpdir/out" 2>"$tmpdir/err" || rc=$?
+./tk -- frobnicate ... 1>"$tmpdir/out" 2>"$tmpdir/err" || rc=$?
 cat "$tmpdir/out" "$tmpdir/err"
 test "$rc" -eq 1
 grep -F 'Unable to find bootstrap.cfg file via --bootstrap-config' "$tmpdir/err"
diff --git a/tk b/tk
index 8aa98b4..b16378e 100755
--- a/tk
+++ b/tk
@@ -1,9 +1,40 @@
 #!/usr/bin/env bash
 
-set -e
+set -ueo pipefail
+
+usage() { echo "Usage: tk JVM_ARG ... -- TK_ARG ..."; }
+misuse() { usage 1>&2; exit 2; }
 
 jar_glob='trapperkeeper-*-SNAPSHOT-standalone.jar'
 
+# Believe last -cp wins for java, and here, any final -cp path will be
+# placed in front of the jar.
+
+cp=''
+jvm_args=()
+while test $# -gt 0; do
+    case "$1" in
+        -h|--help)
+            usage
+            exit 0
+            ;;
+        -cp)
+            shift
+            test $# -gt 0 || misuse
+            cp="$1"
+            shift
+            ;;
+        --)
+            shift
+            break
+            ;;
+        *)
+            shift
+            jvm_args+=("$1")
+            ;;
+    esac
+done
+
 if test "${TRAPPERKEEPER_JAR:-}"; then
     jar="$TRAPPERKEEPER_JAR"
 else
@@ -28,4 +59,11 @@ if ! test -e "$jar"; then
     exit 2
 fi
 
-exec java -jar "$jar" "$@"
+set -x
+if test "$cp"; then
+    cp="$cp:$jar"
+else
+    cp="$jar"
+fi
+
+exec java -cp "$cp" clojure.main -m puppetlabs.trapperkeeper.main "$@"