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-rw-r--r--src/kill.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/kill.c b/src/kill.c
index 314855653..591371c19 100644
--- a/src/kill.c
+++ b/src/kill.c
@@ -23,6 +23,7 @@
#include <signal.h>
#include "system.h"
+#include "c-ctype.h"
#include "sig2str.h"
#include "operand2sig.h"
#include "quote.h"
@@ -154,7 +155,7 @@ list_signals (bool table, char *const *argv)
signum = operand2sig (*argv);
if (signum < 0)
status = EXIT_FAILURE;
- else if (ISDIGIT (**argv))
+ else if (c_isdigit (**argv))
{
if (sig2str (signum, signame) == 0)
puts (signame);