diff --git a/src/config/parse_config.h b/src/config/parse_config.h
index 8a96536..ce5db53 100644
--- a/src/config/parse_config.h
+++ b/src/config/parse_config.h
@@ -79,7 +79,7 @@ typedef struct {
 	int32_t ignore_minimize;
 	int32_t isnosizehint;
 	int32_t indleinhibit_when_focus;
-	const char *monitor;
+	char *monitor;
 	int32_t offsetx;
 	int32_t offsety;
 	int32_t width;
diff --git a/src/mango.c b/src/mango.c
index 8a93a79..9a027a3 100644
--- a/src/mango.c
+++ b/src/mango.c
@@ -1443,7 +1443,7 @@ void applyrules(Client *c) {
 
 		// set monitor of client
 		wl_list_for_each(m, &mons, link) {
-			if (regex_match(r->monitor, m->wlr_output->name)) {
+			if (match_monitor_spec(r->monitor, m)) {
 				mon = m;
 			}
 		}