diff --git a/parser/parser_include.c b/parser/parser_include.c
index d708cb8d7..d44670a1b 100644
--- a/parser/parser_include.c
+++ b/parser/parser_include.c
@@ -202,7 +202,7 @@ static void start_include_position(const char *filename)
 	current_lineno   = 1;
 }
 
-void push_include_stack(char *filename)
+void push_include_stack(const char *filename)
 {
 	struct include_stack_t *include = NULL;
 
diff --git a/parser/parser_include.h b/parser/parser_include.h
index 76b5a647c..52050a7c1 100644
--- a/parser/parser_include.h
+++ b/parser/parser_include.h
@@ -29,7 +29,7 @@ extern void parse_default_paths(void);
 extern int do_include_preprocessing(char *profilename);
 FILE *search_path(char *filename, char **fullpath, bool *skip);
 
-extern void push_include_stack(char *filename);
+extern void push_include_stack(const char *filename);
 extern void pop_include_stack(void);
 extern void reset_include_stack(const char *filename);