diff --git a/format.c b/format.c
index 7690baf..8707947 100644
--- a/format.c
+++ b/format.c
@@ -111,7 +111,7 @@ void mm_write_sam(kstring_t *s, const mm_idx_t *mi, const bseq1_t *t, const mm_r
 	int flag = 0;
 	s->l = 0;
 	if (r == 0) {
-		mm_sprintf_lite(s, "%s\t0\t*\t0\t0\t*\t*\t0\t0\t", t->name);
+		mm_sprintf_lite(s, "%s\t4\t*\t0\t0\t*\t*\t0\t0\t", t->name);
 		sam_write_sq(s, t->seq, t->l_seq, 0, 0);
 		mm_sprintf_lite(s, "\t");
 		if (t->qual) sam_write_sq(s, t->qual, t->l_seq, 0, 0);
diff --git a/main.c b/main.c
index e27a6b9..b360efb 100644
--- a/main.c
+++ b/main.c
@@ -10,7 +10,7 @@
 #include "minimap.h"
 #include "mmpriv.h"
 
-#define MM_VERSION "2.0-r163-pre"
+#define MM_VERSION "2.0-r164-pre"
 
 void liftrlimit()
 {