diff --git a/plugins/sample/sample_plugin.c b/plugins/sample/sample_plugin.c
index c4204102d..33ef42891 100644
--- a/plugins/sample/sample_plugin.c
+++ b/plugins/sample/sample_plugin.c
@@ -49,6 +49,7 @@
 #include <stdarg.h>
 
 #include <sudo_plugin.h>
+#include "compat.h"
 #include "missing.h"
 
 /*