diff --git a/test_audio_routing.c b/test_audio_routing.c
index f65689c..6cc5d16 100644
--- a/test_audio_routing.c
+++ b/test_audio_routing.c
@@ -42,7 +42,9 @@ static atomic_int tests_passed;
 static atomic_int tests_failed;
 
 // Shared buffers for test audio input (written by test thread, read by JACK callback)
-static float test_audio_input[MAX_CHANNELS][TEST_NFRAMES * TEST_DURATION_SECONDS];
+// Max samples = sample_rate * max_duration_seconds (sample_rate is typically 48000)
+#define MAX_SAMPLES (48000 * TEST_DURATION_SECONDS)
+static float test_audio_input[MAX_CHANNELS][MAX_SAMPLES];
 static atomic_size_t test_audio_input_count[MAX_CHANNELS];
 static atomic_size_t test_audio_input_read[MAX_CHANNELS];
 
@@ -51,7 +53,7 @@ static uint8_t test_midi_buffer[3];  // status, note, velocity
 static atomic_bool test_midi_pending;
 
 // Test audio output buffers (written by JACK callback, read by test thread)
-static float test_output_buffer[MAX_CHANNELS][TEST_NFRAMES * TEST_DURATION_SECONDS];
+static float test_output_buffer[MAX_CHANNELS][MAX_SAMPLES];
 static atomic_size_t test_output_count[MAX_CHANNELS];
 
 // ============================================================
@@ -100,7 +102,7 @@ static int test_process_callback(jack_nframes_t nframes, void *arg) {
             jack_port_get_buffer(test_audio_in[ch], nframes);
         
         size_t count = atomic_load(&test_output_count[ch]);
-        if (count + nframes <= TEST_NFRAMES * TEST_DURATION_SECONDS) {
+        if (count + nframes <= MAX_SAMPLES) {
             for (jack_nframes_t i = 0; i < nframes; i++) {
                 test_output_buffer[ch][count + i] = in[i];
             }