diff --git a/src/pulse/internal.h b/src/pulse/internal.h
index ec74f41b2..a10b47dee 100644
--- a/src/pulse/internal.h
+++ b/src/pulse/internal.h
@@ -318,6 +318,6 @@ void pa_ext_device_manager_command(pa_context *c, uint32_t tag, pa_tagstruct *t)
 void pa_ext_device_restore_command(pa_context *c, uint32_t tag, pa_tagstruct *t);
 void pa_ext_stream_restore_command(pa_context *c, uint32_t tag, pa_tagstruct *t);
 
-bool pa_mainloop_is_our_api(pa_mainloop_api*m);
+bool pa_mainloop_is_our_api(const pa_mainloop_api*m);
 
 #endif
diff --git a/src/pulse/mainloop.c b/src/pulse/mainloop.c
index 7d6a99c94..03d724848 100644
--- a/src/pulse/mainloop.c
+++ b/src/pulse/mainloop.c
@@ -971,7 +971,7 @@ void pa_mainloop_set_poll_func(pa_mainloop *m, pa_poll_func poll_func, void *use
     m->poll_func_userdata = userdata;
 }
 
-bool pa_mainloop_is_our_api(pa_mainloop_api *m) {
+bool pa_mainloop_is_our_api(const pa_mainloop_api *m) {
     pa_assert(m);
 
     return m->io_new == mainloop_io_new;