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-rw-r--r--src/operand2sig.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/operand2sig.c b/src/operand2sig.c
index b46cb1bed..fe8749444 100644
--- a/src/operand2sig.c
+++ b/src/operand2sig.c
@@ -27,6 +27,7 @@
#include <sys/wait.h>
#include "system.h"
+#include "c-ctype.h"
#include "quote.h"
#include "sig2str.h"
#include "operand2sig.h"
@@ -36,7 +37,7 @@ operand2sig (char const *operand)
{
int signum;
- if (ISDIGIT (*operand))
+ if (c_isdigit (*operand))
{
/* Note we don't put a limit on the maximum value passed,
because we're checking shell $? values here, and ksh for