diff --git a/src/signal/sigandset.c b/src/signal/sigandset.c
index f9204c49..e0c6f486 100644
--- a/src/signal/sigandset.c
+++ b/src/signal/sigandset.c
@@ -1,7 +1,7 @@
 #define _GNU_SOURCE
 #include <signal.h>
 
-#define SST_SIZE (_NSIG/8)
+#define SST_SIZE (_NSIG/8/sizeof(long))
 
 int sigandset(sigset_t *dest, sigset_t *left, sigset_t *right)
 {
diff --git a/src/signal/sigorset.c b/src/signal/sigorset.c
index 5460224b..df1b1b17 100644
--- a/src/signal/sigorset.c
+++ b/src/signal/sigorset.c
@@ -1,7 +1,7 @@
 #define _GNU_SOURCE
 #include <signal.h>
 
-#define SST_SIZE (_NSIG/8)
+#define SST_SIZE (_NSIG/8/sizeof(long))
 
 int sigorset(sigset_t *dest, sigset_t *left, sigset_t *right)
 {