1 files changed, 1 insertions, 1 deletions
diff --git a/syntax.c b/syntax.c
index 97d0554..3b477e9 100644
--- a/syntax.c
+++ b/syntax.c
@@ -1090,7 +1090,7 @@ static void syntax_highlight_javascript(SyntaxState *state, char32_t const *line
 					// this is not foolproof for detecting regex literals
 					//  but should handle all "reasonable" uses of regex.
 					bool is_regex = i == 0 // slash is first char in line
-						|| (line[i-1] <= WCHAR_MAX && iswspace(line[i-1])) // slash preceded by space
+						|| (line[i-1] <= WCHAR_MAX && iswspace((wint_t)line[i-1])) // slash preceded by space
 						|| (line[i-1] <= 128 && strchr(";({[=,:", (char)line[i-1])); // slash preceded by any of these characters
 					if (is_regex) {
 						in_string = true;