diff --git a/config.def.h b/config.def.h
index 86e4afd..d5d4448 100644
--- a/config.def.h
+++ b/config.def.h
@@ -24,4 +24,5 @@ static const MimeType servermimes[] = {
 	{ "gz",   "application/x-gtar" },
 	{ "pdf",  "application/x-pdf" },
 	{ "tar",  "application/tar" },
+	{ "",     "application/octet-stream" }
 };
diff --git a/quark.c b/quark.c
index 071c5d8..9349101 100644
--- a/quark.c
+++ b/quark.c
@@ -181,7 +181,7 @@ responsefiledata(int fd, off_t size) {
 
 void
 responsefile(void) {
-	const char *mimetype = "unknown";
+	const char *mimetype;
 	char *p;
 	char mod[25];
 	int i, ffd, r;