diff --git a/src/modules/module-lirc.c b/src/modules/module-lirc.c
index 1a318a5fa..b239160ae 100644
--- a/src/modules/module-lirc.c
+++ b/src/modules/module-lirc.c
@@ -161,7 +161,7 @@ static void io_callback(pa_mainloop_api *io, pa_io_event *e, int fd, pa_io_event
                             break;
 
                         case INVALID:
-                            ;
+                            pa_assert_not_reached();
                     }
                 }
             }
diff --git a/src/modules/module-mmkbd-evdev.c b/src/modules/module-mmkbd-evdev.c
index ced3a592a..ccee6e1d4 100644
--- a/src/modules/module-mmkbd-evdev.c
+++ b/src/modules/module-mmkbd-evdev.c
@@ -146,7 +146,7 @@ static void io_callback(pa_mainloop_api *io, pa_io_event *e, int fd, pa_io_event
                             break;
 
                         case INVALID:
-                            ;
+                            pa_assert_not_reached();
                     }
                 }
             }