diff --git a/src/afs/LINUX/osi_vnodeops.c b/src/afs/LINUX/osi_vnodeops.c
index b9d002a446..ea0b13124c 100644
--- a/src/afs/LINUX/osi_vnodeops.c
+++ b/src/afs/LINUX/osi_vnodeops.c
@@ -570,7 +570,7 @@ afs_linux_flush(struct file *fp)
 
     AFS_GLOCK();
 
-    if (fp->f_flags | O_RDONLY) {     /* readers dont flush */
+    if ((fp->f_flags & O_ACCMODE) == O_RDONLY) { /* readers dont flush */
 	AFS_GUNLOCK();
 	return 0;
     }