diff --git a/HTMLtree.c b/HTMLtree.c
index 11a6125..61287e6 100644
--- a/HTMLtree.c
+++ b/HTMLtree.c
@@ -665,7 +665,7 @@
 		xmlChar *escaped;
 		xmlChar *tmp = value;
 
-		while (IS_BLANK(*tmp)) tmp++;
+		while (IS_BLANK_CH(*tmp)) tmp++;
 
 		escaped = xmlURIEscapeStr(tmp, BAD_CAST"@/:=?;#%&,+");
 		if (escaped != NULL) {