diff --git a/checkin_notes b/checkin_notes
index edae1a3dd4..9f256383b5 100755
--- a/checkin_notes
+++ b/checkin_notes
@@ -7769,3 +7769,8 @@ Karl 2003-11-22
 
     client/
         cs_cmdline.C
+
+    - chmod 600 the account file.
+
+    client/
+        client_types.C
diff --git a/client/client_types.C b/client/client_types.C
index 34d3e5a305..89712644b1 100644
--- a/client/client_types.C
+++ b/client/client_types.C
@@ -80,6 +80,9 @@ int PROJECT::write_account_file() {
     get_account_filename(master_url, path);
     f = fopen(TEMP_FILE_NAME, "w");
     if (!f) return ERR_FOPEN;
+#ifndef _WIN32
+    chmod(TEMP_FILE_NAME, 0600);
+#endif
 
     fprintf(f,
         "<account>\n"