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-rw-r--r--posix/regex_internal.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/posix/regex_internal.h b/posix/regex_internal.h
index 7fc6d524e9..154e96999d 100644
--- a/posix/regex_internal.h
+++ b/posix/regex_internal.h
@@ -471,7 +471,7 @@ typedef struct bin_tree_storage_t bin_tree_storage_t;
 
 #define IS_WORD_CHAR(ch) (isalnum (ch) || (ch) == '_')
 #define IS_NEWLINE(ch) ((ch) == NEWLINE_CHAR)
-#define IS_WIDE_WORD_CHAR(ch) (iswalnum (ch) || (ch) == L'_')
+#define IS_WIDE_WORD_CHAR(ch) (__iswalnum (ch) || (ch) == L'_')
 #define IS_WIDE_NEWLINE(ch) ((ch) == WIDE_NEWLINE_CHAR)
 
 #define NOT_SATISFY_PREV_CONSTRAINT(constraint,context) \