diff --git a/format.c b/format.c
index ac25106..a84c735 100644
--- a/format.c
+++ b/format.c
@@ -85,6 +85,7 @@ static void write_cs(void *km, kstring_t *s, const mm_idx_t *mi, const mm_bseq1_
 					if (l_tmp > 0) {
 						tmp[l_tmp] = 0;
 						mm_sprintf_lite(s, "=%s", tmp);
+						l_tmp = 0;
 					}
 					mm_sprintf_lite(s, "*%c%c", "acgtn"[tseq[t_off + j]], "acgtn"[qseq[q_off + j]]);
 				} else tmp[l_tmp++] = "ACGTN"[qseq[q_off + j]];
diff --git a/main.c b/main.c
index 3a62613..f40c00a 100644
--- a/main.c
+++ b/main.c
@@ -8,7 +8,7 @@
 #include "minimap.h"
 #include "mmpriv.h"
 
-#define MM_VERSION "2.0rc1-r236-dirty"
+#define MM_VERSION "2.0rc1-r237-dirty"
 
 void liftrlimit()
 {