diff --git a/sysdeps/htl/include/pthread.h b/sysdeps/htl/include/pthread.h
index 173b1eb08d..a9c0e58b00 100644
--- a/sysdeps/htl/include/pthread.h
+++ b/sysdeps/htl/include/pthread.h
@@ -1,7 +1,8 @@
 #ifndef	_PTHREAD_H
 #include_next <pthread.h>
-#if defined __USE_EXTERN_INLINES && defined _LIBC && !IS_IN (libsupport)
-# include <bits/spin-lock-inline.h>
+#ifndef _ISOMAC
+# if defined __USE_EXTERN_INLINES && defined _LIBC && !IS_IN (libsupport)
+#  include <bits/spin-lock-inline.h>
 
 __extern_inline int
 pthread_spin_destroy (pthread_spinlock_t *__lock)
@@ -32,5 +33,6 @@ pthread_spin_unlock (pthread_spinlock_t *__lock)
 {
   return __pthread_spin_unlock (__lock);
 }
+# endif
 #endif
 #endif