diff --git a/mkisofs/multi.c b/mkisofs/multi.c
index ddd0454..86aef8e 100644
--- a/mkisofs/multi.c
+++ b/mkisofs/multi.c
@@ -1365,6 +1365,13 @@ int
 open_merge_image(path)
 	char	*path;
 {
+    if (path[0] == '-' && path[1] == '\0') {
+#ifdef NEED_O_BINARY
+        setmode(fileno(stdin), O_BINARY);
+#endif
+        in_image = stdin;
+        return(0);
+    }
 #ifndef	USE_SCG
 	in_image = fopen(path, "rb");
 	if (in_image == NULL) {