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-rw-r--r--src/expr.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/expr.c b/src/expr.c
index e5f294122..4a1f22c5b 100644
--- a/src/expr.c
+++ b/src/expr.c
@@ -34,7 +34,7 @@
#include <regex.h>
#include "system.h"
-#ifndef isascii
+#if !defined (isascii) || defined (STDC_HEADERS)
#define isascii(c) 1
#endif