diff --git a/fsdev/9p-marshal.c b/fsdev/9p-marshal.c
index a01bba6908..51881fe220 100644
--- a/fsdev/9p-marshal.c
+++ b/fsdev/9p-marshal.c
@@ -18,6 +18,8 @@
 
 #include "9p-marshal.h"
 
+P9ARRAY_DEFINE_TYPE(V9fsString, v9fs_string_free);
+
 void v9fs_string_free(V9fsString *str)
 {
     g_free(str->data);
diff --git a/fsdev/9p-marshal.h b/fsdev/9p-marshal.h
index ceaf2f521e..f1abbe151c 100644
--- a/fsdev/9p-marshal.h
+++ b/fsdev/9p-marshal.h
@@ -1,10 +1,13 @@
 #ifndef QEMU_9P_MARSHAL_H
 #define QEMU_9P_MARSHAL_H
 
+#include "p9array.h"
+
 typedef struct V9fsString {
     uint16_t size;
     char *data;
 } V9fsString;
+P9ARRAY_DECLARE_TYPE(V9fsString);
 
 typedef struct V9fsQID {
     uint8_t type;