diff --git a/src/document/html/parser/parse.c b/src/document/html/parser/parse.c
index 5d6e74fc1..7a675a3a9 100644
--- a/src/document/html/parser/parse.c
+++ b/src/document/html/parser/parse.c
@@ -250,7 +250,7 @@ parse_error:
  * It will return a positive integer value on success,
  * or -1 on error. */
 int
-get_num(char *a, char *name, int cp)
+get_num(char *a, const char *name, int cp)
 {
 	char *al = get_attr_val(a, name, cp);
 	int result = -1;
diff --git a/src/document/html/parser/parse.h b/src/document/html/parser/parse.h
index c73ee8043..30222c5c6 100644
--- a/src/document/html/parser/parse.h
+++ b/src/document/html/parser/parse.h
@@ -64,7 +64,7 @@ typedef void (element_handler_T)(struct html_context *, char *attr,
 
 int parse_element(char *, char *, char **, int *, char **, char **);
 
-int get_num(char *, char *, int);
+int get_num(char *, const char *, int);
 int get_num2(char *);
 
 int get_width(char *, char *, int, struct html_context *);