diff --git a/align.c b/align.c
index 8945af4..c1478e3 100644
--- a/align.c
+++ b/align.c
@@ -369,8 +369,8 @@ static int mm_align1_inv(void *km, const mm_mapopt_t *opt, const mm_idx_t *mi, i
 	if (r1->rid != r2->rid || r1->rev != r2->rev) return 0;
 	ql = r2->qs - r1->qe;
 	tl = r2->rs - r1->re;
-	if (ql < 0 || ql > opt->max_gap) return 0;
-	if (tl < 0 || tl > opt->max_gap) return 0;
+	if (ql < opt->min_chain_score || ql > opt->max_gap) return 0;
+	if (tl < opt->min_chain_score || tl > opt->max_gap) return 0;
 
 	ksw_gen_simple_mat(5, mat, opt->a, opt->b);
 	tseq = (uint8_t*)kmalloc(km, tl);
diff --git a/main.c b/main.c
index f435158..a6ae930 100644
--- a/main.c
+++ b/main.c
@@ -8,7 +8,7 @@
 #include "minimap.h"
 #include "mmpriv.h"
 
-#define MM_VERSION "2.0-r227-dirty"
+#define MM_VERSION "2.0-r228-dirty"
 
 void liftrlimit()
 {