1 files changed, 6 insertions, 2 deletions
diff --git a/src/sanity.c b/src/sanity.c
index df3cbe2..c542aec 100644
--- a/src/sanity.c
+++ b/src/sanity.c
@@ -1,6 +1,7 @@
 #include <stdio.h>
 #include <string.h>
 #include "u816.h"
+#include "dupname.h"
 
 extern const char *self;
 
@@ -64,6 +65,9 @@ void sanity_check_filename(const char *fname) {
 		bad_atari_filename(fname, "invalid characters.");
 	else if(uscore)
 		fprintf(stderr, "%s: filename has underscore, OK on Sparta/MyDOS, not Atari DOS 2.x\n", self);
-}
-
 
+	if(is_dup_filename(fname)) {
+		fprintf(stderr, "%s: warning: duplicate Atari filename %s\n",
+				self, fname);
+	}
+}