diff --git a/src/output.c b/src/output.c
index a4c18ff..bb19f8f 100644
--- a/src/output.c
+++ b/src/output.c
@@ -270,6 +270,8 @@ const char* output_power_state_name(enum output_power_state state)
 	case OUTPUT_POWER_UNKNOWN:
 		return "??";
 	}
+	abort();
+	return NULL;
 }
 
 static void output_power_mode(void *data,