From master, will be in 0.3.33
diff --git a/meson.build b/meson.build
index 838fb66be8ca0e2d66009696f6c00c2ff7580b6e..977ce9ba1f22a2785efcb1b5a5bee08cf2e4bec3 100644
--- a/meson.build
+++ b/meson.build
@@ -254,6 +254,9 @@ endif
 if cc.has_function('getpagesize', prefix : '#include<unistd.h>')
   cdata.set('HAVE_GETPAGESIZE', 1)
 endif
+if cc.has_function('gettid', prefix : '#include<unistd.h>', args: [ '-D_GNU_SOURCE' ])
+  cdata.set('HAVE_GETTID', 1)
+endif
 if cc.has_function('clock_gettime', prefix : '#include <time.h>')
   cdata.set('HAVE_CLOCK_GETTIME', 1)
 endif
diff --git a/src/modules/module-rtkit.c b/src/modules/module-rtkit.c
index 1f13aa371192bee738c4e10b45917473d2f9856d..7d55fb758cdc0a3073e3e3f2536949e824ffa223 100644
--- a/src/modules/module-rtkit.c
+++ b/src/modules/module-rtkit.c
@@ -182,12 +182,16 @@ void pw_rtkit_bus_free(struct pw_rtkit_bus *system_bus)
 
 static pid_t _gettid(void)
 {
-#ifndef __FreeBSD__
+#if defined(HAVE_GETTID)
 	return (pid_t) gettid();
-#else
+#elif defined(__linux__)
+	return syscall(SYS_gettid);
+#elif defined(__FreeBSD__)
 	long pid;
 	thr_self(&pid);
 	return (pid_t)pid;
+#else
+#error "No gettid impl"
 #endif
 }
 
diff --git a/src/modules/module-rtkit.c b/src/modules/module-rtkit.c
index de30f4123cf017f8be2eb7d4cd3bababb51da6fc..419e4be815a46d0f466969a02813f481d48ee5a1 100644
--- a/src/modules/module-rtkit.c
+++ b/src/modules/module-rtkit.c
@@ -518,7 +518,7 @@ static void *custom_start(void *data)
 	struct impl *impl = this->impl;
 
 	pthread_mutex_lock(&impl->lock);
-	this->pid = gettid();
+	this->pid = _gettid();
 	pthread_cond_broadcast(&impl->cond);
 	pthread_mutex_unlock(&impl->lock);
 
diff --git a/src/modules/module-rtkit.c b/src/modules/module-rtkit.c
index 419e4be815a46d0f466969a02813f481d48ee5a1..1f13aa371192bee738c4e10b45917473d2f9856d 100644
--- a/src/modules/module-rtkit.c
+++ b/src/modules/module-rtkit.c
@@ -592,7 +592,7 @@ static pid_t impl_gettid(struct impl *impl, pthread_t pt)
 	if ((thr = find_thread_by_pt(impl, pt)) != NULL)
 		pid = thr->pid;
 	else
-		pid = getpid();
+		pid = _gettid();
 	pthread_mutex_unlock(&impl->lock);
 
 	return pid;