diff --git a/src/load-fragment-gperf.gperf.m4 b/src/load-fragment-gperf.gperf.m4
index 650f44490..8e52890db 100644
--- a/src/load-fragment-gperf.gperf.m4
+++ b/src/load-fragment-gperf.gperf.m4
@@ -2,6 +2,7 @@
 #include <stddef.h>
 #include "conf-parser.h"
 #include "load-fragment.h"
+#include "missing.h"
 %}
 struct ConfigPerfItem;
 %null_strings