diff --git a/bwamem_pair.c b/bwamem_pair.c
index 38827843..5d4c5c29 100644
--- a/bwamem_pair.c
+++ b/bwamem_pair.c
@@ -70,6 +70,7 @@ void mem_pestat(const mem_opt_t *opt, int64_t l_pac, int n, const mem_alnreg_v *
 		if (q->n < MIN_DIR_CNT) {
 			fprintf(stderr, "[M::%s] skip orientation %c%c as there are not enough pairs\n", __func__, "FR"[d>>1&1], "FR"[d&1]);
 			r->failed = 1;
+			free(q->a);
 			continue;
 		} else fprintf(stderr, "[M::%s] analyzing insert size distribution for orientation %c%c...\n", __func__, "FR"[d>>1&1], "FR"[d&1]);
 		ks_introsort_64(q->n, q->a);
diff --git a/main.c b/main.c
index 12b0930a..07a9d008 100644
--- a/main.c
+++ b/main.c
@@ -4,7 +4,7 @@
 #include "utils.h"
 
 #ifndef PACKAGE_VERSION
-#define PACKAGE_VERSION "0.7.10-r933-dirty"
+#define PACKAGE_VERSION "0.7.10-r939-dirty"
 #endif
 
 int bwa_fa2pac(int argc, char *argv[]);