diff --git a/lisp/net/tramp.el b/lisp/net/tramp.el
index 8f5eb5096a2..8988e57b8df 100644
--- a/lisp/net/tramp.el
+++ b/lisp/net/tramp.el
@@ -1019,7 +1019,7 @@ See also `tramp-file-name-regexp'.")
   (car tramp-file-name-structure))
 
 ;;;###autoload
-(defconst tramp-initial-file-name-regexp "\\`/.+:.*:"
+(defconst tramp-initial-file-name-regexp "\\`/[^/:]+:[^/:]*:"
   "Value for `tramp-file-name-regexp' for autoload.
 It must match the initial `tramp-syntax' settings.")