diff --git a/libc/include/pthread.h b/libc/include/pthread.h
index 50f2024..c67f239 100644
--- a/libc/include/pthread.h
+++ b/libc/include/pthread.h
@@ -245,7 +245,10 @@
 
 pthread_t pthread_self(void) __pure2;
 
+#if defined(__USE_GNU)
+int pthread_getname_np(pthread_t, char*, size_t) __nonnull((2));
 int pthread_setname_np(pthread_t, const char*) __nonnull((2));
+#endif
 
 int pthread_setschedparam(pthread_t, int, const struct sched_param*) __nonnull((3));