diff --git a/builtin-blame.c b/builtin-blame.c
index da23a6f9c99e1db691ba9329ea33a320b56b6afc..0519339098f3258ae6cc2b50d30679a8cfc7f2c7 100644
--- a/builtin-blame.c
+++ b/builtin-blame.c
@@ -518,8 +518,8 @@ static struct patch *compare_buffer(mmfile_t *file_p, mmfile_t *file_o,
 	xdemitcb_t ecb;
 
 	xpp.flags = xdl_opts;
+	memset(&xecfg, 0, sizeof(xecfg));
 	xecfg.ctxlen = context;
-	xecfg.flags = 0;
 	ecb.outf = xdiff_outf;
 	ecb.priv = &state;
 	memset(&state, 0, sizeof(state));
diff --git a/builtin-rerere.c b/builtin-rerere.c
index 29fb075d29d2deb849e51578e2818d44dbb2a0d5..01f3848f1429cca93a5953118a74276f7f66b065 100644
--- a/builtin-rerere.c
+++ b/builtin-rerere.c
@@ -282,8 +282,8 @@ static int diff_two(const char *file1, const char *label1,
 	printf("--- a/%s\n+++ b/%s\n", label1, label2);
 	fflush(stdout);
 	xpp.flags = XDF_NEED_MINIMAL;
+	memset(&xecfg, 0, sizeof(xecfg));
 	xecfg.ctxlen = 3;
-	xecfg.flags = 0;
 	ecb.outf = outf;
 	xdl_diff(&minus, &plus, &xpp, &xecfg, &ecb);
 
diff --git a/combine-diff.c b/combine-diff.c
index ea3ca5f950561a92fdd3be1a4ee4bbd726656118..ef622340a52afb3b31b1cdf678ae0a83fb85c923 100644
--- a/combine-diff.c
+++ b/combine-diff.c
@@ -215,8 +215,7 @@ static void combine_diff(const unsigned char *parent, mmfile_t *result_file,
 	parent_file.ptr = grab_blob(parent, &sz);
 	parent_file.size = sz;
 	xpp.flags = XDF_NEED_MINIMAL;
-	xecfg.ctxlen = 0;
-	xecfg.flags = 0;
+	memset(&xecfg, 0, sizeof(xecfg));
 	ecb.outf = xdiff_outf;
 	ecb.priv = &state;
 	memset(&state, 0, sizeof(state));
diff --git a/diff.c b/diff.c
index 16ea7100dfba40f30b6f9024c90131cdcfaf9b4b..d10e848c792bba581d6bf3e30204a81204177983 100644
--- a/diff.c
+++ b/diff.c
@@ -390,6 +390,7 @@ static void diff_words_show(struct diff_words_data *diff_words)
 	mmfile_t minus, plus;
 	int i;
 
+	memset(&xecfg, 0, sizeof(xecfg));
 	minus.size = diff_words->minus.text.size;
 	minus.ptr = xmalloc(minus.size);
 	memcpy(minus.ptr, diff_words->minus.text.ptr, minus.size);
@@ -408,7 +409,6 @@ static void diff_words_show(struct diff_words_data *diff_words)
 
 	xpp.flags = XDF_NEED_MINIMAL;
 	xecfg.ctxlen = diff_words->minus.alloc + diff_words->plus.alloc;
-	xecfg.flags = 0;
 	ecb.outf = xdiff_outf;
 	ecb.priv = diff_words;
 	diff_words->xm.consume = fn_out_diff_words_aux;
@@ -1218,6 +1218,7 @@ static void builtin_diff(const char *name_a,
 		xdemitcb_t ecb;
 		struct emit_callback ecbdata;
 
+		memset(&xecfg, 0, sizeof(xecfg));
 		memset(&ecbdata, 0, sizeof(ecbdata));
 		ecbdata.label_path = lbl;
 		ecbdata.color_diff = o->color_diff;
@@ -1286,9 +1287,8 @@ static void builtin_diffstat(const char *name_a, const char *name_b,
 		xdemitconf_t xecfg;
 		xdemitcb_t ecb;
 
+		memset(&xecfg, 0, sizeof(xecfg));
 		xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
-		xecfg.ctxlen = 0;
-		xecfg.flags = 0;
 		ecb.outf = xdiff_outf;
 		ecb.priv = diffstat;
 		xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
@@ -1326,9 +1326,8 @@ static void builtin_checkdiff(const char *name_a, const char *name_b,
 		xdemitconf_t xecfg;
 		xdemitcb_t ecb;
 
+		memset(&xecfg, 0, sizeof(xecfg));
 		xpp.flags = XDF_NEED_MINIMAL;
-		xecfg.ctxlen = 0;
-		xecfg.flags = 0;
 		ecb.outf = xdiff_outf;
 		ecb.priv = &data;
 		xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
@@ -2780,6 +2779,7 @@ static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
 		struct diff_filepair *p = q->queue[i];
 		int len1, len2;
 
+		memset(&xecfg, 0, sizeof(xecfg));
 		if (p->status == 0)
 			return error("internal diff status error");
 		if (p->status == DIFF_STATUS_UNKNOWN)
diff --git a/merge-file.c b/merge-file.c
index 748d15c0e04c0d63fbe586ad59c795ddaf3dec92..1e031eafe0c70eec092a53e8ab291b9887622b0e 100644
--- a/merge-file.c
+++ b/merge-file.c
@@ -62,6 +62,7 @@ static int generate_common_file(mmfile_t *res, mmfile_t *f1, mmfile_t *f2)
 	xdemitcb_t ecb;
 
 	xpp.flags = XDF_NEED_MINIMAL;
+	memset(&xecfg, 0, sizeof(xecfg));
 	xecfg.ctxlen = 3;
 	xecfg.flags = XDL_EMIT_COMMON;
 	ecb.outf = common_outf;
diff --git a/merge-tree.c b/merge-tree.c
index 3b8d9e6887ae051bf61cc0833f97d83bb47a0bae..7d4f628444058d80e798e141285d558fb7104c5b 100644
--- a/merge-tree.c
+++ b/merge-tree.c
@@ -106,8 +106,8 @@ static void show_diff(struct merge_list *entry)
 	xdemitcb_t ecb;
 
 	xpp.flags = XDF_NEED_MINIMAL;
+	memset(&xecfg, 0, sizeof(xecfg));
 	xecfg.ctxlen = 3;
-	xecfg.flags = 0;
 	ecb.outf = show_outf;
 	ecb.priv = NULL;