diff --git a/tests/integration.c b/tests/integration.c
index d0a9458..44668da 100644
--- a/tests/integration.c
+++ b/tests/integration.c
@@ -208,11 +208,15 @@ static void test_clock_continue(void) {
 
 static int test_audio_pass_through(void) {
     printf("Test: audio pass‑through (connectivity)\n");
+    pid_t pid = start_looper();
+    if (pid < 0) return 1;
     jack_client_t *client;
     jack_status_t status;
     client = jack_client_open("test_passthrough", JackNoStartServer, &status);
     if (client == NULL) {
         fprintf(stderr, "  SKIP: cannot open JACK client (server not running?)\n");
+        kill(pid, SIGTERM);
+        waitpid(pid, NULL, 0);
         return 1;
     }
     jack_port_t *output_port = jack_port_register(client, "output",
@@ -224,6 +228,8 @@ static int test_audio_pass_through(void) {
     if (!output_port || !input_port) {
         fprintf(stderr, "  FAIL: could not register ports\n");
         jack_client_close(client);
+        kill(pid, SIGTERM);
+        waitpid(pid, NULL, 0);
         return 1;
     }
     usleep(200000);
@@ -235,11 +241,15 @@ static int test_audio_pass_through(void) {
     if (jack_connect(client, my_output, looper_input) != 0) {
         fprintf(stderr, "  FAIL: cannot connect test_passthrough:output -> looper:input\n");
         jack_client_close(client);
+        kill(pid, SIGTERM);
+        waitpid(pid, NULL, 0);
         return 1;
     }
     if (jack_connect(client, looper_output, my_input) != 0) {
         fprintf(stderr, "  FAIL: cannot connect looper:output -> test_passthrough:input\n");
         jack_client_close(client);
+        kill(pid, SIGTERM);
+        waitpid(pid, NULL, 0);
         return 1;
     }
     passthrough_output_port = output_port;
@@ -254,6 +264,8 @@ static int test_audio_pass_through(void) {
     if (jack_activate(client) != 0) {
         fprintf(stderr, "  FAIL: cannot activate client\n");
         jack_client_close(client);
+        kill(pid, SIGTERM);
+        waitpid(pid, NULL, 0);
         return 1;
     }
     usleep(2200000); /* 2.2 seconds */
@@ -262,6 +274,8 @@ static int test_audio_pass_through(void) {
                  sqrt(passthrough_sum_sq / passthrough_total_samples) : 0.0;
     jack_deactivate(client);
     jack_client_close(client);
+    kill(pid, SIGTERM);
+    waitpid(pid, NULL, 0);
     if (!saw_input) {
         fprintf(stderr, "  FAIL: looper did not produce output (no callback run?)\n");
         return 1;