diff --git a/src/signal/sigandset.c b/src/signal/sigandset.c
index f62c7fec1ae28bdb7548877e6d527f7f5533cc4f..78f9600d31433ffcfbf37af44112aec620075214 100644
--- a/src/signal/sigandset.c
+++ b/src/signal/sigandset.c
@@ -2,7 +2,7 @@
 #include <signal.h>
 #include <errno.h>
 
-#define SST_SIZE (sizeof(sigset_t) / sizeof(long))
+#define SST_SIZE (_NSIG/8)
 
 int sigandset(sigset_t *dest, sigset_t *left, sigset_t *right)
 {
diff --git a/src/signal/sigorset.c b/src/signal/sigorset.c
index 232075b1c281504c792264aa8fdc541f50a19507..eb5feab465fe5e5c08304520e217979985ced4c1 100644
--- a/src/signal/sigorset.c
+++ b/src/signal/sigorset.c
@@ -2,7 +2,7 @@
 #include <signal.h>
 #include <errno.h>
 
-#define SST_SIZE (sizeof(sigset_t) / sizeof(long))
+#define SST_SIZE (_NSIG/8)
 
 int sigorset(sigset_t *dest, sigset_t *left, sigset_t *right)
 {