diff --git a/bwamem.c b/bwamem.c
index 0b8ec48..488913a 100644
--- a/bwamem.c
+++ b/bwamem.c
@@ -63,8 +63,8 @@ mem_opt_t *mem_opt_init()
 	o->chunk_size = 10000000;
 	o->n_threads = 1;
 	o->max_matesw = 100;
-	o->mapQ_coef_len = 100;
-	o->mapQ_coef_fac = log(o->mapQ_coef_len);
+//	o->mapQ_coef_len = 100; o->mapQ_coef_fac = log(o->mapQ_coef_len);
+	o->mapQ_coef_len = o->mapQ_coef_fac = 0;
 	bwa_fill_scmat(o->a, o->b, o->mat);
 	return o;
 }
diff --git a/main.c b/main.c
index dd60d1c..fdf48b8 100644
--- a/main.c
+++ b/main.c
@@ -3,7 +3,7 @@
 #include "utils.h"
 
 #ifndef PACKAGE_VERSION
-#define PACKAGE_VERSION "0.7.5a-r406"
+#define PACKAGE_VERSION "0.7.5a-r411"
 #endif
 
 int bwa_fa2pac(int argc, char *argv[]);