diff --git a/example-clients/midi_latency_test.c b/example-clients/midi_latency_test.c
index 1bece0d3..d9e6fb08 100644
--- a/example-clients/midi_latency_test.c
+++ b/example-clients/midi_latency_test.c
@@ -95,7 +95,11 @@ char *program_name;
 jack_port_t *remote_in_port;
 jack_port_t *remote_out_port;
 size_t samples;
+#ifdef __APPLE__
+sem_t* semaphore;
+#else
 sem_t semaphore;
+#endif
 pthread_mutex_t start_mutex;
 int timeout;
 jack_nframes_t total_latency;
@@ -212,7 +216,11 @@ handle_process(jack_nframes_t frames, void *arg)
         messages_received++;
         if (messages_received == samples) {
             process_state = 2;
+        #ifdef __APPLE__
+            sem_post(semaphore);
+        #else
             sem_post(&semaphore);
+        #endif
             break;
         }
     send_message:
@@ -302,7 +310,11 @@ set_process_error(const char *source, const char *message)
     error_source = source;
     error_message = message;
     process_state = -1;
+ #ifdef __APPLE__
+    sem_post(semaphore);
+#else
     sem_post(&semaphore);
+#endif
 }
 
 int
@@ -460,11 +472,22 @@ main(int argc, char **argv)
     jack_on_shutdown(client, handle_shutdown, NULL);
     jack_set_info_function(handle_info);
     process_state = 0;
+#ifdef __APPLE__
+    // sem_init is not implemented on OSX
+    char name[128];
+    sprintf(name, "midi_sem_%p", client);
+    if ((semaphore = sem_open(name, O_CREAT, 0777, 0)) == (sem_t*)SEM_FAILED) {
+        error_message = strerror(errno);
+        error_source = "sem_open";
+        goto unregister_out_port;
+    }
+#else
     if (sem_init(&semaphore, 0, 0)) {
         error_message = strerror(errno);
         error_source = "sem_init";
         goto unregister_out_port;
     }
+#endif
     code = pthread_mutex_init(&start_mutex, NULL);
     if (code) {
         error_message = strerror(errno);
@@ -500,11 +523,15 @@ main(int argc, char **argv)
         error_source = "pthread_mutex_unlock";
         goto deactivate_client;
     }
+#ifdef __APPLE__
+    while (sem_wait(semaphore) != 0) {}
+#else
     if (sem_wait(&semaphore)) {
         error_message = strerror(errno);
         error_source = "sem_wait";
         goto deactivate_client;
     }
+#endif
     if (process_state == 2) {
         double average_latency = ((double) total_latency) / samples;
         double average_latency_time = total_latency_time / samples;
@@ -572,7 +599,11 @@ main(int argc, char **argv)
  destroy_mutex:
     pthread_mutex_destroy(&start_mutex);
  destroy_semaphore:
+#ifdef __APPLE__
+    sem_destroy(semaphore);
+#else
     sem_destroy(&semaphore);
+#endif
  unregister_out_port:
     jack_port_unregister(client, out_port);
  unregister_in_port:
@@ -592,5 +623,8 @@ main(int argc, char **argv)
         output_error(error_source, error_message);
         exit(EXIT_FAILURE);
     }
+#ifdef __APPLE__
+    sem_unlink(name);
+#endif
     return EXIT_SUCCESS;
 }
diff --git a/macosx/Jackdmp.xcodeproj/project.pbxproj b/macosx/Jackdmp.xcodeproj/project.pbxproj
index efe5e9eb..edfbae28 100644
--- a/macosx/Jackdmp.xcodeproj/project.pbxproj
+++ b/macosx/Jackdmp.xcodeproj/project.pbxproj
@@ -871,7 +871,7 @@
 			isa = PBXContainerItemProxy;
 			containerPortal = 08FB7793FE84155DC02AAC07 /* Project object */;
 			proxyType = 1;
-			remoteGlobalIDString = 4B2021DC133A9BA40019E213 /* jack_midi_latency 64 bits */;
+			remoteGlobalIDString = 4B2021DC133A9BA40019E213;
 			remoteInfo = "jack_midi_latency 64 bits";
 		};
 		4B224B330E65BA330066BE5B /* PBXContainerItemProxy */ = {