diff --git a/iwyu_path_util.cc b/iwyu_path_util.cc
index 9987ea4..b63a5c0 100644
--- a/iwyu_path_util.cc
+++ b/iwyu_path_util.cc
@@ -86,7 +86,7 @@ string Basename(const string& path) {
 string GetCanonicalName(string file_path) {
   // For this special 'path' we just return it.
   // Note that we leave the 'quotes' to make it different from regular paths.
-  if (file_path == "<built-in>")
+  if (file_path == "<built-in>" || file_path == "<stdin>")
     return file_path;
 
   CHECK_(!IsQuotedInclude(file_path));