diff --git a/src/afs/afs_buffer.c b/src/afs/afs_buffer.c
index 4399473585..2220ae301c 100644
--- a/src/afs/afs_buffer.c
+++ b/src/afs/afs_buffer.c
@@ -379,6 +379,8 @@ afs_newslot(struct dcache *adc, afs_int32 apage, struct buffer *lp)
 	AFS_STATS(afs_stats_cmperf.bufFlushDirty++);
     }
 
+    /* Zero out the data so we don't leak something we shouldn't. */
+    memset(lp->data, 0, AFS_BUFFER_PAGESIZE);
     /* Now fill in the header. */
     lp->fid = adc->index;
     afs_copy_inode(&lp->inode, &adc->f.inode);