diff --git a/bwamem.c b/bwamem.c
index 9f59e12..b8a12a3 100644
--- a/bwamem.c
+++ b/bwamem.c
@@ -992,14 +992,14 @@ void mem_reg2sam_se(const mem_opt_t *opt, const bntseq_t *bns, const uint8_t *pa
 	} else {
 		for (k = 0; k < aa.n; ++k)
 			mem_aln2sam(bns, &str, s, aa.n, aa.a, k, m, opt->flag&MEM_F_SOFTCLIP);
-		for (k = 0; k < aa.n; ++k) {
-			free(aa.a[k].cigar);
-			free(aa.a[k].XA);
-		}
+		for (k = 0; k < aa.n; ++k) free(aa.a[k].cigar);
 		free(aa.a);
 	}
 	s->sam = str.s;
-	if (XA) free(XA);
+	if (XA) {
+		for (k = 0; k < a->n; ++k) free(XA[k]);
+		free(XA);
+	}
 }
 
 mem_alnreg_v mem_align1_core(const mem_opt_t *opt, const bwt_t *bwt, const bntseq_t *bns, const uint8_t *pac, int l_seq, char *seq, void *buf)
diff --git a/bwamem_pair.c b/bwamem_pair.c
index 2901dfe..27973ca 100644
--- a/bwamem_pair.c
+++ b/bwamem_pair.c
@@ -335,8 +335,7 @@ int mem_sam_pe(const mem_opt_t *opt, const bntseq_t *bns, const uint8_t *pac, co
 		// free XA
 		for (i = 0; i < 2; ++i) {
 			if (XA[i]) {
-				for (j = 0; j < a[i].n; ++j)
-					free(XA[i][j]);
+				for (j = 0; j < a[i].n; ++j) free(XA[i][j]);
 				free(XA[i]);
 			}
 		}
diff --git a/main.c b/main.c
index 183d330..31b74ec 100644
--- a/main.c
+++ b/main.c
@@ -4,7 +4,7 @@
 #include "utils.h"
 
 #ifndef PACKAGE_VERSION
-#define PACKAGE_VERSION "0.7.8-r778-dirty"
+#define PACKAGE_VERSION "0.7.8-r779-dirty"
 #endif
 
 int bwa_fa2pac(int argc, char *argv[]);