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-rw-r--r--include/wchar.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/wchar.h b/include/wchar.h
index 52da6395..ad727a86 100644
--- a/include/wchar.h
+++ b/include/wchar.h
@@ -172,9 +172,12 @@ int       iswctype(wint_t, wctype_t);
 wint_t    towlower(wint_t);
 wint_t    towupper(wint_t);
 wctype_t  wctype(const char *);
+
+#ifndef __cplusplus
 #undef iswdigit
 #define iswdigit(a) ((unsigned)(a)-'0' < 10)
 #endif
+#endif
 
 #ifdef __cplusplus
 }