diff --git a/src/thread-common.c b/src/thread-common.c
index ee8a9fcf8d0..a6c914f4a5d 100644
--- a/src/thread-common.c
+++ b/src/thread-common.c
@@ -27,10 +27,6 @@
 #include <pthread.h>
 #endif
 
-#if defined(PTHREAD_BARRIER_SERIAL_THREAD)
-STATIC_ASSERT(sizeof(uv_barrier_t) == sizeof(pthread_barrier_t));
-#endif
-
 /* Note: guard clauses should match uv_barrier_t's in include/uv/unix.h. */
 #if defined(_AIX) || \
     defined(__OpenBSD__) || \
@@ -113,6 +109,8 @@ void uv_barrier_destroy(uv_barrier_t* barrier) {
 
 #else
 
+STATIC_ASSERT(sizeof(uv_barrier_t) == sizeof(pthread_barrier_t));
+
 int uv_barrier_init(uv_barrier_t* barrier, unsigned int count) {
   return UV__ERR(pthread_barrier_init(barrier, NULL, count));
 }