diff --git a/arch/arm/bits/signal.h b/arch/arm/bits/signal.h
index 328388d4..2f83cb99 100644
--- a/arch/arm/bits/signal.h
+++ b/arch/arm/bits/signal.h
@@ -71,3 +71,5 @@ struct sigcontext
 #define SIGPWR    30
 #define SIGSYS    31
 #define SIGUNUSED SIGSYS
+
+#define _NSIG 65
diff --git a/arch/i386/bits/signal.h b/arch/i386/bits/signal.h
index ab9a92cb..f899663c 100644
--- a/arch/i386/bits/signal.h
+++ b/arch/i386/bits/signal.h
@@ -80,3 +80,5 @@ struct sigcontext {
 #define SIGPWR    30
 #define SIGSYS    31
 #define SIGUNUSED SIGSYS
+
+#define _NSIG 65
diff --git a/arch/microblaze/bits/signal.h b/arch/microblaze/bits/signal.h
index 0358245d..ed900390 100644
--- a/arch/microblaze/bits/signal.h
+++ b/arch/microblaze/bits/signal.h
@@ -73,3 +73,5 @@ struct sigcontext
 #define SIGPWR    30
 #define SIGSYS    31
 #define SIGUNUSED SIGSYS
+
+#define _NSIG 65
diff --git a/arch/mips/bits/signal.h b/arch/mips/bits/signal.h
index f51c29b9..603aed3e 100644
--- a/arch/mips/bits/signal.h
+++ b/arch/mips/bits/signal.h
@@ -82,3 +82,5 @@ struct sigcontext
 #define SIGXCPU   30
 #define SIGXFSZ   31
 #define SIGUNUSED SIGSYS
+
+#define _NSIG 129
diff --git a/arch/powerpc/bits/signal.h b/arch/powerpc/bits/signal.h
index a5c311ba..56b599ef 100644
--- a/arch/powerpc/bits/signal.h
+++ b/arch/powerpc/bits/signal.h
@@ -114,3 +114,5 @@ typedef struct __ucontext {
 #define SIGPWR    30
 #define SIGSYS    31
 #define SIGUNUSED SIGSYS
+
+#define _NSIG 65
diff --git a/arch/x86_64/bits/signal.h b/arch/x86_64/bits/signal.h
index 11375b9a..cfe7dbbc 100644
--- a/arch/x86_64/bits/signal.h
+++ b/arch/x86_64/bits/signal.h
@@ -78,3 +78,5 @@ struct sigcontext {
 #define SIGPWR    30
 #define SIGSYS    31
 #define SIGUNUSED SIGSYS
+
+#define _NSIG 65
diff --git a/include/signal.h b/include/signal.h
index 1014440d..bef8ae04 100644
--- a/include/signal.h
+++ b/include/signal.h
@@ -217,6 +217,7 @@ void (*bsd_signal(int, void (*)(int)))(int);
 int sigisemptyset(const sigset_t *);
 #define SA_NOMASK SA_NODEFER
 #define SA_ONESHOT SA_RESETHAND
+#define NSIG _NSIG
 #endif
 
 #include <bits/signal.h>