diff --git a/bwamem.c b/bwamem.c
index fe83f93..346715c 100644
--- a/bwamem.c
+++ b/bwamem.c
@@ -1036,6 +1036,7 @@ mem_aln_t mem_reg2aln2(const mem_opt_t *opt, const bntseq_t *bns, const uint8_t
 		}
 	}
 	a.rid = bns_pos2rid(bns, pos);
+	assert(a.rid == ar->rid);
 	a.pos = pos - bns->anns[a.rid].offset;
 	a.score = ar->score; a.sub = ar->sub > ar->csub? ar->sub : ar->csub;
 	free(query);
diff --git a/bwamem_extra.c b/bwamem_extra.c
index aee1eb4..2eb87d6 100644
--- a/bwamem_extra.c
+++ b/bwamem_extra.c
@@ -90,6 +90,7 @@ void mem_reg2ovlp(const mem_opt_t *opt, const bntseq_t *bns, const uint8_t *pac,
 		int64_t pos, rb = p->rb, re = p->re;
 		pos = bns_depos(bns, rb < bns->l_pac? rb : re - 1, &is_rev);
 		rid = bns_pos2rid(bns, pos);
+		assert(rid == a->rid);
 		pos -= bns->anns[rid].offset;
 		kputs(s->name, &str); kputc('\t', &str);
 		kputw(s->l_seq, &str); kputc('\t', &str);
diff --git a/main.c b/main.c
index 49cc9ae..d78832b 100644
--- a/main.c
+++ b/main.c
@@ -4,7 +4,7 @@
 #include "utils.h"
 
 #ifndef PACKAGE_VERSION
-#define PACKAGE_VERSION "0.7.8+dev-r472"
+#define PACKAGE_VERSION "0.7.8+dev-r473"
 #endif
 
 int bwa_fa2pac(int argc, char *argv[]);