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-rw-r--r--src/ctype/iswalnum.c4
1 files changed, 1 insertions, 3 deletions
diff --git a/src/ctype/iswalnum.c b/src/ctype/iswalnum.c
index d3b56674..35dbe02c 100644
--- a/src/ctype/iswalnum.c
+++ b/src/ctype/iswalnum.c
@@ -1,9 +1,7 @@
 #include <wchar.h>
 #include <wctype.h>
 
-#undef iswalnum
-
 int iswalnum(wint_t wc)
 {
-	return (unsigned)wc-'0' < 10 || iswalpha(wc);
+	return iswdigit(wc) || iswalpha(wc);
 }