diff --git a/include/signal.h b/include/signal.h
index 91eb3ea..76a2c75 100644
--- a/include/signal.h
+++ b/include/signal.h
@@ -8,3 +8,7 @@
 #ifndef SIGINFO
 #define SIGINFO SIGUSR1
 #endif
+
+#ifndef _NSIG
+#define _NSIG NSIG
+#endif