diff --git a/fs/spiffs/src/spiffs_vfs.c b/fs/spiffs/src/spiffs_vfs.c
index 475c9c9c12..a56e93365f 100644
--- a/fs/spiffs/src/spiffs_vfs.c
+++ b/fs/spiffs/src/spiffs_vfs.c
@@ -648,8 +648,8 @@ static ssize_t spiffs_write(FAR struct file *filep, FAR const char *buffer,
   off_t offset;
   int ret;
 
-  finfo("filep=%p buffer=%p buflen=%lu\n",
-        filep, buffer, (unsigned long)buflen);
+  finfo("filep=%p buffer=%p buflen=%zu\n",
+        filep, buffer, buflen);
   DEBUGASSERT(filep->f_priv != NULL && filep->f_inode != NULL);
 
   /* Get the mountpoint inode reference from the file structure and the
@@ -765,9 +765,10 @@ static ssize_t spiffs_write(FAR struct file *filep, FAR const char *buffer,
               offset_in_cpage = offset - fobj->cache_page->offset;
 
               spiffs_cacheinfo("Storing to cache page %d for fobj %d "
-                               "offset=%d:%d buflen=%d\n",
-                               fobj->cache_page->cpndx, fobj->objid, offset,
-                               offset_in_cpage, buflen);
+                               "offset=%jd:%jd buflen=%zu\n",
+                               fobj->cache_page->cpndx, fobj->objid,
+                               (intmax_t)offset,
+                               (intmax_t)offset_in_cpage, buflen);
 
               cache      = spiffs_get_cache(fs);
               cpage_data = spiffs_get_cache_page(fs, cache,