diff --git a/bwamem_extra.c b/bwamem_extra.c
index e717d7b..96cdbcd 100644
--- a/bwamem_extra.c
+++ b/bwamem_extra.c
@@ -99,7 +99,8 @@ void mem_reg2ovlp(const mem_opt_t *opt, const bntseq_t *bns, const uint8_t *pac,
 		kputs(bns->anns[rid].name, &str); kputc('\t', &str);
 		kputw(bns->anns[rid].len, &str); kputc('\t', &str);
 		kputw(pos, &str); kputc('\t', &str); kputw(pos + (re - rb), &str); kputc('\t', &str);
-		kputw(p->truesc, &str); kputc('\n', &str);
+		ksprintf(&str, "%.3f", (double)p->truesc / opt->a / (qe - qb > re - rb? qe - qb : re - rb));
+		kputc('\n', &str);
 	}
 	s->sam = str.s;
 }
diff --git a/main.c b/main.c
index 2cf9471..a64fd5f 100644
--- a/main.c
+++ b/main.c
@@ -4,7 +4,7 @@
 #include "utils.h"
 
 #ifndef PACKAGE_VERSION
-#define PACKAGE_VERSION "0.7.8+dev-r474"
+#define PACKAGE_VERSION "0.7.8+dev-r475"
 #endif
 
 int bwa_fa2pac(int argc, char *argv[]);