diff --git a/bwa.1 b/bwa.1
index 1edbf12..9d45a3d 100644
--- a/bwa.1
+++ b/bwa.1
@@ -1,4 +1,4 @@
-.TH bwa 1 "15 March 2013" "bwa-0.7.3a" "Bioinformatics tools"
+.TH bwa 1 "15 March 2013" "bwa-0.7.4" "Bioinformatics tools"
 .SH NAME
 .PP
 bwa - Burrows-Wheeler Alignment Tool
@@ -220,7 +220,7 @@ deducted. [5]
 Penalty for an unpaired read pair. BWA-MEM scores an unpaired read pair as
 .RI scoreRead1+scoreRead2- INT
 and scores a paired as scoreRead1+scoreRead2-insertPenalty. It compares these
-two scores to determine whether we should force pairing. [9]
+two scores to determine whether we should force pairing. [17]
 .TP
 .B -p
 Assume the first input query file is interleaved paired-end FASTA/Q. See the command description for details.
diff --git a/bwamem.c b/bwamem.c
index 182b57a..921b512 100644
--- a/bwamem.c
+++ b/bwamem.c
@@ -46,7 +46,7 @@ mem_opt_t *mem_opt_init()
 	o->a = 1; o->b = 4; o->q = 6; o->r = 1; o->w = 100;
 	o->T = 30;
 	o->zdrop = 100;
-	o->pen_unpaired = 9;
+	o->pen_unpaired = 17;
 	o->pen_clip = 5;
 	o->min_seed_len = 19;
 	o->split_width = 10;
diff --git a/main.c b/main.c
index 8c1343c..ea92d81 100644
--- a/main.c
+++ b/main.c
@@ -3,7 +3,7 @@
 #include "utils.h"
 
 #ifndef PACKAGE_VERSION
-#define PACKAGE_VERSION "0.7.3-r376-beta"
+#define PACKAGE_VERSION "0.7.3-r377-beta"
 #endif
 
 int bwa_fa2pac(int argc, char *argv[]);