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-rw-r--r--signal/signal.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/signal/signal.h b/signal/signal.h
index c803a5bec4..5d63375947 100644
--- a/signal/signal.h
+++ b/signal/signal.h
@@ -32,7 +32,7 @@ __BEGIN_DECLS
#include <bits/types.h>
#include <bits/sigset.h> /* __sigset_t, __sig_atomic_t. */
-#if defined _SIGNAL_H && defined __USE_UNIX98 && !defined pid_t
+#if defined _SIGNAL_H && defined __USE_XOPEN && !defined pid_t
typedef __pid_t pid_t;
# define pid_t pid_t
#endif /* Unix98 */