diff --git a/src/pipewire/conf.c b/src/pipewire/conf.c
index 89d61066b..bd2fe1f0a 100644
--- a/src/pipewire/conf.c
+++ b/src/pipewire/conf.c
@@ -1040,7 +1040,7 @@ static int match_rules(void *data, const char *location, const char *section,
 
 SPA_EXPORT
 int pw_context_conf_section_match_rules(struct pw_context *context, const char *section,
-		struct spa_dict *props,
+		const struct spa_dict *props,
 		int (*callback) (void *data, const char *location, const char *action,
 			const char *str, size_t len),
 		void *data)
diff --git a/src/pipewire/context.h b/src/pipewire/context.h
index 84baf31d0..31292c463 100644
--- a/src/pipewire/context.h
+++ b/src/pipewire/context.h
@@ -125,7 +125,7 @@ int pw_context_conf_section_for_each(struct pw_context *context, const char *sec
 		void *data);
 /** emit callback for all matched properties. Since 0.3.46 */
 int pw_context_conf_section_match_rules(struct pw_context *context, const char *section,
-		struct spa_dict *props,
+		const struct spa_dict *props,
 		int (*callback) (void *data, const char *location, const char *action,
 			const char *str, size_t len),
 		void *data);