diff --git a/fs/vfs/fs_epoll.c b/fs/vfs/fs_epoll.c
index 4babda57c79..ef1b1fd9965 100644
--- a/fs/vfs/fs_epoll.c
+++ b/fs/vfs/fs_epoll.c
@@ -41,6 +41,7 @@
 
 #include <sys/epoll.h>
 
+#include <inttypes.h>
 #include <stdint.h>
 #include <poll.h>
 #include <errno.h>
@@ -165,7 +166,7 @@ int epoll_ctl(int epfd, int op, int fd, struct epoll_event *ev)
   switch (op)
     {
       case EPOLL_CTL_ADD:
-        finfo("%08x CTL ADD(%d): fd=%d ev=%08x\n",
+        finfo("%08x CTL ADD(%d): fd=%d ev=%08" PRIx32 "\n",
               epfd, eph->occupied, fd, ev->events);
 
         eph->data[eph->occupied]        = ev->data;
@@ -202,7 +203,7 @@ int epoll_ctl(int epfd, int op, int fd, struct epoll_event *ev)
         {
           int i;
 
-          finfo("%08x CTL MOD(%d): fd=%d ev=%08x\n",
+          finfo("%08x CTL MOD(%d): fd=%d ev=%08" PRIx32 "\n",
                 epfd, eph->occupied, fd, ev->events);
 
           for (i = 0; i < eph->occupied; i++)