diff --git a/ksw2_extd2_sse.c b/ksw2_extd2_sse.c
index a993a2d..b18d0cc 100644
--- a/ksw2_extd2_sse.c
+++ b/ksw2_extd2_sse.c
@@ -111,7 +111,7 @@ void ksw_extd2_sse(void *km, int qlen, const uint8_t *query, int tlen, const uin
 		for (t = 0; t < tlen_ * 16; ++t) H[t] = KSW_NEG_INF;
 	}
 	if (with_cigar) {
-		mem2 = (uint8_t*)kmalloc(km, ((qlen + tlen - 1) * n_col_ + 1) * 16);
+		mem2 = (uint8_t*)kmalloc(km, ((size_t)(qlen + tlen - 1) * n_col_ + 1) * 16);
 		p = (__m128i*)(((size_t)mem2 + 15) >> 4 << 4);
 		off = (int*)kmalloc(km, (qlen + tlen - 1) * sizeof(int) * 2);
 		off_end = off + qlen + tlen - 1;
diff --git a/main.c b/main.c
index 376f18f..263eb89 100644
--- a/main.c
+++ b/main.c
@@ -10,7 +10,7 @@
 #include "getopt.h"
 #endif
 
-#define MM_VERSION "2.10-r772-dirty"
+#define MM_VERSION "2.10-r773-dirty"
 
 #ifdef __linux__
 #include <sys/resource.h>