diff --git a/tests/integration.c b/tests/integration.c
index f27b1b5..cf5eef5 100644
--- a/tests/integration.c
+++ b/tests/integration.c
@@ -10,6 +10,7 @@
 #include <jack/jack.h>
 #include <jack/midiport.h>
 #include <math.h>
+#include <time.h>
 
 /* static variables for passthrough test */
 static jack_port_t *passthrough_output_port = NULL;
@@ -32,6 +33,13 @@ static jack_client_t *midi_inject_client = NULL;
 static unsigned char midi_inject_note = 0;
 static unsigned char midi_inject_velocity = 0;
 
+static void safe_usleep(unsigned int usec) {
+    struct timespec ts;
+    ts.tv_sec = usec / 1000000;
+    ts.tv_nsec = (usec % 1000000) * 1000L;
+    nanosleep(&ts, NULL);
+}
+
 static int midi_inject_process(jack_nframes_t nframes, void *arg) {
     (void)arg;
     if (!midi_inject_port) return 0;
@@ -57,8 +65,8 @@ static int passthrough_process(jack_nframes_t nframes, void *arg) {
     (void)arg;
     jack_default_audio_sample_t *out =
         (jack_default_audio_sample_t *)jack_port_get_buffer(passthrough_output_port, nframes);
-    jack_default_audio_sample_t *in =
-        (jack_default_audio_sample_t *)jack_port_get_buffer(passthrough_input_port, nframes);
+    const jack_default_audio_sample_t *in =
+        (const jack_default_audio_sample_t *)jack_port_get_buffer(passthrough_input_port, nframes);
     if (!out || !in) return 0;
     float *outf = out;
     const float *inf = in;
@@ -195,7 +203,7 @@ static int test_audio_pass_through(void) {
         waitpid(pid, NULL, 0);
         return 1;
     }
-    usleep(2200000); /* 2.2 seconds */
+    safe_usleep(2200000);
     int saw_input = passthrough_done;
     double rms = passthrough_total_samples > 0 ?
                  sqrt(passthrough_sum_sq / passthrough_total_samples) : 0.0;
@@ -349,7 +357,7 @@ static int test_looper_looping(void) {
     }
 
     /* wait enough time for several loops (4 seconds to be safe) */
-    usleep(4000000);
+    safe_usleep(4000000);
 
     jack_deactivate(client);
     jack_client_close(client);
@@ -390,7 +398,7 @@ static int test_multiple_channels(void) {
     }
     /* wait long enough for the looper's main loop to process the add command
        (it sleeps for 1 second between checks, so 1.5 s is safe) */
-    usleep(1500000);
+    safe_usleep(1500000);
 
     int found = 0;
     const char **ports = jack_get_ports(client, NULL, JACK_DEFAULT_AUDIO_TYPE, 0);
@@ -500,7 +508,7 @@ static int test_control_key_modifier(void) {
         fprintf(stderr, "  FAIL: send note 62 for loop\n");
         return 1;
     }
-    usleep(2000000);   /* wait for a few loops */
+    safe_usleep(2000000);
     jack_deactivate(client);
     jack_client_close(client);
     kill(pid, SIGTERM);
@@ -613,7 +621,7 @@ static int test_bind_channel(void) {
         fprintf(stderr, "  FAIL: toggle for loop\n");
         return 1;
     }
-    usleep(2000000);
+    safe_usleep(2000000);
     jack_deactivate(client);
     jack_client_close(client);
     kill(pid, SIGTERM);
@@ -741,7 +749,7 @@ static int test_bind_unbind(void) {
         fprintf(stderr, "  FAIL: toggle for loop\n");
         return 1;
     }
-    usleep(2000000);
+    safe_usleep(2000000);
     jack_deactivate(client);
     jack_client_close(client);
     kill(pid, SIGTERM);
@@ -776,7 +784,7 @@ static int test_remove_channel(void) {
         fprintf(stderr, "  FAIL: send note 60 failed\n");
         return 1;
     }
-    usleep(1500000);
+    safe_usleep(1500000);
     /* verify channel1_input exists */
     const char **ports = jack_get_ports(client, NULL, JACK_DEFAULT_AUDIO_TYPE, 0);
     int found = 0;
@@ -803,7 +811,7 @@ static int test_remove_channel(void) {
         fprintf(stderr, "  FAIL: send note 61 failed\n");
         return 1;
     }
-    usleep(1500000);
+    safe_usleep(1500000);
     /* verify channel1_input has disappeared */
     ports = jack_get_ports(client, NULL, JACK_DEFAULT_AUDIO_TYPE, 0);
     int still_found = 0;