diff --git a/tests/integration.c b/tests/integration.c
index e086243..73a4b50 100644
--- a/tests/integration.c
+++ b/tests/integration.c
@@ -320,6 +320,15 @@ static int test_looper_looping(void) {
     bursts = 0;
     prev_above = 0;
 
+    passthrough_output_port = audio_out;
+    passthrough_input_port = audio_in;
+    passthrough_phase = 0.0f;
+    passthrough_freq = 440.0f;
+    passthrough_sample_rate = sr;
+    passthrough_total_samples = 0;
+    passthrough_sum_sq = 0.0;
+    passthrough_done = 0;
+
     jack_set_process_callback(client, passthrough_process, NULL);
     if (jack_activate(client)) {
         jack_client_close(client);