diff --git a/winsup/cygwin/ChangeLog b/winsup/cygwin/ChangeLog
index e47287d64..0ee8d61c3 100644
--- a/winsup/cygwin/ChangeLog
+++ b/winsup/cygwin/ChangeLog
@@ -1,3 +1,8 @@
+2002-05-22  Corinna Vinschen  <corinna@vinschen.de>
+
+	* include/cygwin/types.h: Define pthread stuff only if _POSIX_THREADS
+	is defined.
+
 2002-05-19  Pierre Humblet <pierre.humblet@ieee.org>
 
         * security.cc (open_local_policy): Initialize lsa to
diff --git a/winsup/cygwin/include/cygwin/types.h b/winsup/cygwin/include/cygwin/types.h
index 92b60b7a3..92f437f05 100644
--- a/winsup/cygwin/include/cygwin/types.h
+++ b/winsup/cygwin/include/cygwin/types.h
@@ -50,6 +50,7 @@ typedef __gid16_t gid_t;
 #endif
 
 #if !defined(__INSIDE_CYGWIN__) || !defined(__cplusplus)
+#if defined(_POSIX_THREADS)
 
 typedef void *pthread_t;
 typedef void *pthread_mutex_t;
@@ -87,6 +88,7 @@ typedef class pthread_rwlockattr *pthread_rwlockattr_t;
 
 /* semaphores types */
 typedef class semaphore *sem_t;
+#endif /* defined(_POSIX_THREADS) */
 #endif /* __INSIDE_CYGWIN__ */
 #endif /* _CYGWIN_TYPES_H */