diff --git a/src/tests/thread-test.c b/src/tests/thread-test.c
index 9e8afd9bb..9559cdbbb 100644
--- a/src/tests/thread-test.c
+++ b/src/tests/thread-test.c
@@ -25,6 +25,7 @@
 
 #include <pulsecore/thread.h>
 #include <pulsecore/mutex.h>
+#include <pulsecore/once.h>
 #include <pulsecore/log.h>
 #include <pulsecore/core-util.h>
 #include <pulse/xmalloc.h>
@@ -37,6 +38,12 @@ static int magic_number = 0;
 
 #define THREADS_MAX 20
 
+static void once_func(void) {
+    pa_log("once!");
+}
+
+static pa_once_t once = PA_ONCE_INIT;
+
 static void thread_func(void *data) {
     pa_tls_set(tls, data);
 
@@ -65,6 +72,8 @@ static void thread_func(void *data) {
 
         pa_mutex_unlock(mutex);
 
+        pa_once(&once, once_func);
+
         pa_cond_signal(cond2, 0);
         
         pa_log("%s got number %i", (char*) pa_tls_get(tls), k);