diff --git a/bwa.c b/bwa.c
index c78ebb6..1ca5634 100644
--- a/bwa.c
+++ b/bwa.c
@@ -144,9 +144,9 @@ uint32_t *bwa_gen_cigar2(const int8_t mat[25], int o_del, int e_del, int o_ins,
 		max_del = (int)((double)(((l_query+1)>>1) * mat[0] - o_del) / e_del + 1.);
 		max_gap = max_ins > max_del? max_ins : max_del;
 		max_gap = max_gap > 1? max_gap : 1;
-		w = (max_gap + abs(rlen - l_query) + 1) >> 1;
+		w = (max_gap + abs((int)rlen - l_query) + 1) >> 1;
 		w = w < w_? w : w_;
-		min_w = abs(rlen - l_query) + 3;
+		min_w = abs((int)rlen - l_query) + 3;
 		w = w > min_w? w : min_w;
 		// NW alignment
 		if (bwa_verbose >= 4) {
diff --git a/bwase.c b/bwase.c
index 77c50db..37e4274 100644
--- a/bwase.c
+++ b/bwase.c
@@ -173,13 +173,15 @@ bwa_cigar_t *bwa_refine_gapped_core(bwtint_t l_pac, const ubyte_t *pacseq, int l
 	ubyte_t *rseq;
 	int64_t k, rb, re, rlen;
 	int8_t mat[25];
+	int w;
 
 	bwa_fill_scmat(1, 3, mat);
 	rb = *_rb; re = rb + len + ref_shift;
 	assert(re <= l_pac);
 	rseq = bns_get_seq(l_pac, pacseq, rb, re, &rlen);
 	assert(re - rb == rlen);
-	ksw_global(len, seq, rlen, rseq, 5, mat, 5, 1, SW_BW > abs(rlen - len) * 1.5? SW_BW : abs(rlen - len) * 1.5, n_cigar, &cigar32);
+	w = abs((int)rlen - len) * 1.5;
+	ksw_global(len, seq, rlen, rseq, 5, mat, 5, 1, SW_BW > w? SW_BW : w, n_cigar, &cigar32);
 	assert(*n_cigar > 0);
 	if ((cigar32[*n_cigar - 1]&0xf) == 1) cigar32[*n_cigar - 1] = (cigar32[*n_cigar - 1]>>4<<4) | 3; // change endding ins to soft clipping
 	if ((cigar32[0]&0xf) == 1) cigar32[0] = (cigar32[0]>>4<<4) | 3; // change beginning ins to soft clipping
diff --git a/bwtsw2_pair.c b/bwtsw2_pair.c
index b945128..f48dcb6 100644
--- a/bwtsw2_pair.c
+++ b/bwtsw2_pair.c
@@ -236,7 +236,7 @@ void bsw2_pair(const bsw2opt_t *opt, int64_t l_pac, const uint8_t *pac, int n, b
 					double diff;
 					G[0] = hits[i]->hits[0].G + a[1].G;
 					G[1] = hits[i+1]->hits[0].G + a[0].G;
-					diff = fabs(G[0] - G[1]) / (opt->a + opt->b) / ((hits[i]->hits[0].len + a[1].len + hits[i+1]->hits[0].len + a[0].len) / 2.);
+					diff = fabs((double)(G[0] - G[1])) / (opt->a + opt->b) / ((hits[i]->hits[0].len + a[1].len + hits[i+1]->hits[0].len + a[0].len) / 2.);
 					if (diff > 0.05) a[G[0] > G[1]? 0 : 1].G = 0;
 				}
 				if (a[0].G == 0 || a[1].G == 0) { // one proper pair only