diff --git a/src/pulsecore/mutex-posix.c b/src/pulsecore/mutex-posix.c
index 74c5768a8..36c2787b6 100644
--- a/src/pulsecore/mutex-posix.c
+++ b/src/pulsecore/mutex-posix.c
@@ -42,7 +42,9 @@ struct pa_cond {
 pa_mutex* pa_mutex_new(bool recursive, bool inherit_priority) {
     pa_mutex *m;
     pthread_mutexattr_t attr;
+#ifdef HAVE_PTHREAD_PRIO_INHERIT
     int r;
+#endif
 
     pa_assert_se(pthread_mutexattr_init(&attr) == 0);