diff --git a/main.c b/main.c
index 90f621b..2148b8f 100644
--- a/main.c
+++ b/main.c
@@ -6,7 +6,7 @@
 #include "mmpriv.h"
 #include "getopt.h"
 
-#define MM_VERSION "2.3-r550-dirty"
+#define MM_VERSION "2.3-r552-dirty"
 
 #ifdef __linux__
 #include <sys/resource.h>
diff --git a/minimap.h b/minimap.h
index d5c22fd..63e23d3 100644
--- a/minimap.h
+++ b/minimap.h
@@ -72,7 +72,7 @@ typedef struct {
 	int32_t as;                     // offset in the a[] array (for internal uses only)
 	int32_t mlen, blen;             // seeded exact match length; seeded alignment block length
 	uint32_t mapq:8, split:2, n_sub:22; // mapQ; split pattern; number of suboptimal mappings
-	uint32_t sam_pri:1, proper_frag:1, iden_flt:1, pe_thru:1, dummy:29;
+	uint32_t sam_pri:1, proper_frag:1, iden_flt:1, pe_thru:1, dummy:28;
 	uint32_t hash;
 	mm_extra_t *p;
 } mm_reg1_t;