diff --git a/common/sudo_printf.c b/common/sudo_printf.c
index bf3e812f6..09839242a 100644
--- a/common/sudo_printf.c
+++ b/common/sudo_printf.c
@@ -29,6 +29,7 @@
 #include <stdarg.h>
 #include <errno.h>
 
+#include "missing.h"
 #include "sudo_plugin.h"
 #include "sudo_debug.h"