diff --git a/bin/cat/cat.c b/bin/cat/cat.c
--- a/bin/cat/cat.c
+++ b/bin/cat/cat.c
@@ -271,7 +271,7 @@
 				    errno == EISDIR)
 					raw_cat(fd);
 				else
-					err(1, "stdout");
+					err(1, "%s", filename);
 			}
 #else
 			raw_cat(fd);