diff --git a/libgo/runtime/thread-linux.c b/libgo/runtime/thread-linux.c
index b51f4970d25..c08cc0dba29 100644
--- a/libgo/runtime/thread-linux.c
+++ b/libgo/runtime/thread-linux.c
@@ -62,6 +62,10 @@ runtime_futexwakeup(uint32 *addr, uint32 cnt)
 	*(int32*)0x1006 = 0x1006;
 }
 
+#ifndef O_CLOEXEC
+#define O_CLOEXEC 0
+#endif
+
 static int32
 getproccount(void)
 {