diff --git a/bloom.c b/bloom.c
index c915f8b1ba..c428634105 100644
--- a/bloom.c
+++ b/bloom.c
@@ -476,8 +476,6 @@ struct bloom_filter *get_or_compute_bloom_filter(struct repository *r,
 				*last_slash = '\0';
 
 			} while (*path);
-
-			diff_free_filepair(diff_queued_diff.queue[i]);
 		}
 
 		if (hashmap_get_size(&pathmap) > settings->max_changed_paths) {
@@ -508,8 +506,6 @@ struct bloom_filter *get_or_compute_bloom_filter(struct repository *r,
 	cleanup:
 		hashmap_clear_and_free(&pathmap, struct pathmap_hash_entry, entry);
 	} else {
-		for (i = 0; i < diff_queued_diff.nr; i++)
-			diff_free_filepair(diff_queued_diff.queue[i]);
 		init_truncated_large_filter(filter, settings->hash_version);
 
 		if (computed)
@@ -519,9 +515,7 @@ struct bloom_filter *get_or_compute_bloom_filter(struct repository *r,
 	if (computed)
 		*computed |= BLOOM_COMPUTED;
 
-	free(diff_queued_diff.queue);
-	DIFF_QUEUE_CLEAR(&diff_queued_diff);
-
+	diff_queue_clear(&diff_queued_diff);
 	return filter;
 }
 
diff --git a/diff.c b/diff.c
index 173cbe2bed..3e9137ffed 100644
--- a/diff.c
+++ b/diff.c
@@ -5983,11 +5983,18 @@ void diff_free_filepair(struct diff_filepair *p)
 	free(p);
 }
 
-void diff_free_queue(struct diff_queue_struct *q)
+void diff_queue_init(struct diff_queue_struct *q)
+{
+	struct diff_queue_struct blank = DIFF_QUEUE_INIT;
+	memcpy(q, &blank, sizeof(*q));
+}
+
+void diff_queue_clear(struct diff_queue_struct *q)
 {
 	for (int i = 0; i < q->nr; i++)
 		diff_free_filepair(q->queue[i]);
 	free(q->queue);
+	diff_queue_init(q);
 }
 
 const char *diff_aligned_abbrev(const struct object_id *oid, int len)
@@ -6551,8 +6558,7 @@ int diff_flush_patch_id(struct diff_options *options, struct object_id *oid, int
 	struct diff_queue_struct *q = &diff_queued_diff;
 	int result = diff_get_patch_id(options, oid, diff_header_only);
 
-	diff_free_queue(q);
-	DIFF_QUEUE_CLEAR(q);
+	diff_queue_clear(q);
 
 	return result;
 }
@@ -6835,8 +6841,7 @@ void diff_flush(struct diff_options *options)
 	}
 
 free_queue:
-	diff_free_queue(q);
-	DIFF_QUEUE_CLEAR(q);
+	diff_queue_clear(q);
 	diff_free(options);
 
 	/*
@@ -6867,9 +6872,7 @@ static void diffcore_apply_filter(struct diff_options *options)
 {
 	int i;
 	struct diff_queue_struct *q = &diff_queued_diff;
-	struct diff_queue_struct outq;
-
-	DIFF_QUEUE_CLEAR(&outq);
+	struct diff_queue_struct outq = DIFF_QUEUE_INIT;
 
 	if (!options->filter)
 		return;
@@ -6962,8 +6965,7 @@ static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
 {
 	int i;
 	struct diff_queue_struct *q = &diff_queued_diff;
-	struct diff_queue_struct outq;
-	DIFF_QUEUE_CLEAR(&outq);
+	struct diff_queue_struct outq = DIFF_QUEUE_INIT;
 
 	for (i = 0; i < q->nr; i++) {
 		struct diff_filepair *p = q->queue[i];
diff --git a/diffcore-break.c b/diffcore-break.c
index 02735f80c6..c4c2173f30 100644
--- a/diffcore-break.c
+++ b/diffcore-break.c
@@ -131,7 +131,7 @@ static int should_break(struct repository *r,
 void diffcore_break(struct repository *r, int break_score)
 {
 	struct diff_queue_struct *q = &diff_queued_diff;
-	struct diff_queue_struct outq;
+	struct diff_queue_struct outq = DIFF_QUEUE_INIT;
 
 	/* When the filepair has this much edit (insert and delete),
 	 * it is first considered to be a rewrite and broken into a
@@ -178,8 +178,6 @@ void diffcore_break(struct repository *r, int break_score)
 	if (!merge_score)
 		merge_score = DEFAULT_MERGE_SCORE;
 
-	DIFF_QUEUE_CLEAR(&outq);
-
 	for (i = 0; i < q->nr; i++) {
 		struct diff_filepair *p = q->queue[i];
 		int score;
@@ -275,11 +273,9 @@ static void merge_broken(struct diff_filepair *p,
 void diffcore_merge_broken(void)
 {
 	struct diff_queue_struct *q = &diff_queued_diff;
-	struct diff_queue_struct outq;
+	struct diff_queue_struct outq = DIFF_QUEUE_INIT;
 	int i, j;
 
-	DIFF_QUEUE_CLEAR(&outq);
-
 	for (i = 0; i < q->nr; i++) {
 		struct diff_filepair *p = q->queue[i];
 		if (!p)
diff --git a/diffcore-pickaxe.c b/diffcore-pickaxe.c
index b195fa4eb3..43fef8e8ba 100644
--- a/diffcore-pickaxe.c
+++ b/diffcore-pickaxe.c
@@ -182,9 +182,7 @@ static void pickaxe(struct diff_queue_struct *q, struct diff_options *o,
 		    regex_t *regexp, kwset_t kws, pickaxe_fn fn)
 {
 	int i;
-	struct diff_queue_struct outq;
-
-	DIFF_QUEUE_CLEAR(&outq);
+	struct diff_queue_struct outq = DIFF_QUEUE_INIT;
 
 	if (o->pickaxe_opts & DIFF_PICKAXE_ALL) {
 		/* Showing the whole changeset if needle exists */
diff --git a/diffcore-rename.c b/diffcore-rename.c
index 3d6826baa3..1b1c1a6a1f 100644
--- a/diffcore-rename.c
+++ b/diffcore-rename.c
@@ -1388,7 +1388,7 @@ void diffcore_rename_extended(struct diff_options *options,
 	int detect_rename = options->detect_rename;
 	int minimum_score = options->rename_score;
 	struct diff_queue_struct *q = &diff_queued_diff;
-	struct diff_queue_struct outq;
+	struct diff_queue_struct outq = DIFF_QUEUE_INIT;
 	struct diff_score *mx;
 	int i, j, rename_count, skip_unmodified = 0;
 	int num_destinations, dst_cnt;
@@ -1638,7 +1638,6 @@ void diffcore_rename_extended(struct diff_options *options,
 	 * are recorded in rename_dst.  The original list is still in *q.
 	 */
 	trace2_region_enter("diff", "write back to queue", options->repo);
-	DIFF_QUEUE_CLEAR(&outq);
 	for (i = 0; i < q->nr; i++) {
 		struct diff_filepair *p = q->queue[i];
 		struct diff_filepair *pair_to_free = NULL;
diff --git a/diffcore-rotate.c b/diffcore-rotate.c
index 533986cf63..73ca20b331 100644
--- a/diffcore-rotate.c
+++ b/diffcore-rotate.c
@@ -10,7 +10,7 @@
 void diffcore_rotate(struct diff_options *opt)
 {
 	struct diff_queue_struct *q = &diff_queued_diff;
-	struct diff_queue_struct outq;
+	struct diff_queue_struct outq = DIFF_QUEUE_INIT;
 	int rotate_to, i;
 
 	if (!q->nr)
@@ -31,7 +31,6 @@ void diffcore_rotate(struct diff_options *opt)
 		return;
 	}
 
-	DIFF_QUEUE_CLEAR(&outq);
 	rotate_to = i;
 
 	for (i = rotate_to; i < q->nr; i++)
diff --git a/diffcore.h b/diffcore.h
index 1701ed50b9..2feb325031 100644
--- a/diffcore.h
+++ b/diffcore.h
@@ -153,18 +153,16 @@ struct diff_queue_struct {
 	int nr;
 };
 
-#define DIFF_QUEUE_CLEAR(q) \
-	do { \
-		(q)->queue = NULL; \
-		(q)->nr = (q)->alloc = 0; \
-	} while (0)
+#define DIFF_QUEUE_INIT { 0 }
+
+void diff_queue_init(struct diff_queue_struct *q);
+void diff_queue_clear(struct diff_queue_struct *q);
 
 extern struct diff_queue_struct diff_queued_diff;
 struct diff_filepair *diff_queue(struct diff_queue_struct *,
 				 struct diff_filespec *,
 				 struct diff_filespec *);
 void diff_q(struct diff_queue_struct *, struct diff_filepair *);
-void diff_free_queue(struct diff_queue_struct *q);
 
 /* dir_rename_relevance: the reason we want rename information for a dir */
 enum dir_rename_relevance {
diff --git a/line-log.c b/line-log.c
index 67c80b39a0..89e0ea4562 100644
--- a/line-log.c
+++ b/line-log.c
@@ -787,15 +787,14 @@ static void move_diff_queue(struct diff_queue_struct *dst,
 			    struct diff_queue_struct *src)
 {
 	assert(src != dst);
-	memcpy(dst, src, sizeof(struct diff_queue_struct));
-	DIFF_QUEUE_CLEAR(src);
+	memcpy(dst, src, sizeof(*dst));
+	diff_queue_init(src);
 }
 
 static void filter_diffs_for_paths(struct line_log_data *range, int keep_deletions)
 {
 	int i;
-	struct diff_queue_struct outq;
-	DIFF_QUEUE_CLEAR(&outq);
+	struct diff_queue_struct outq = DIFF_QUEUE_INIT;
 
 	for (i = 0; i < diff_queued_diff.nr; i++) {
 		struct diff_filepair *p = diff_queued_diff.queue[i];
@@ -850,12 +849,12 @@ static void queue_diffs(struct line_log_data *range,
 		clear_pathspec(&opt->pathspec);
 		parse_pathspec_from_ranges(&opt->pathspec, range);
 	}
-	DIFF_QUEUE_CLEAR(&diff_queued_diff);
+	diff_queue_clear(&diff_queued_diff);
 	diff_tree_oid(parent_tree_oid, tree_oid, "", opt);
 	if (opt->detect_rename && diff_might_be_rename()) {
 		/* must look at the full tree diff to detect renames */
 		clear_pathspec(&opt->pathspec);
-		DIFF_QUEUE_CLEAR(&diff_queued_diff);
+		diff_queue_clear(&diff_queued_diff);
 
 		diff_tree_oid(parent_tree_oid, tree_oid, "", opt);
 
@@ -1097,7 +1096,7 @@ static struct diff_filepair *diff_filepair_dup(struct diff_filepair *pair)
 static void free_diffqueues(int n, struct diff_queue_struct *dq)
 {
 	for (int i = 0; i < n; i++)
-		diff_free_queue(&dq[i]);
+		diff_queue_clear(&dq[i]);
 	free(dq);
 }
 
@@ -1200,7 +1199,7 @@ static int process_ranges_ordinary_commit(struct rev_info *rev, struct commit *c
 	if (parent)
 		add_line_range(rev, parent, parent_range);
 	free_line_log_data(parent_range);
-	diff_free_queue(&queue);
+	diff_queue_clear(&queue);
 	return changed;
 }
 
diff --git a/log-tree.c b/log-tree.c
index 3758e0d3b8..60774c16b3 100644
--- a/log-tree.c
+++ b/log-tree.c
@@ -675,7 +675,7 @@ static void show_diff_of_diff(struct rev_info *opt)
 		struct diff_queue_struct dq;
 
 		memcpy(&dq, &diff_queued_diff, sizeof(diff_queued_diff));
-		DIFF_QUEUE_CLEAR(&diff_queued_diff);
+		diff_queue_init(&diff_queued_diff);
 
 		fprintf_ln(opt->diffopt.file, "\n%s", opt->idiff_title);
 		show_interdiff(opt->idiff_oid1, opt->idiff_oid2, 2,
@@ -694,7 +694,7 @@ static void show_diff_of_diff(struct rev_info *opt)
 		};
 
 		memcpy(&dq, &diff_queued_diff, sizeof(diff_queued_diff));
-		DIFF_QUEUE_CLEAR(&diff_queued_diff);
+		diff_queue_init(&diff_queued_diff);
 
 		fprintf_ln(opt->diffopt.file, "\n%s", opt->rdiff_title);
 		/*
diff --git a/merge-ort.c b/merge-ort.c
index 8b81153e8f..11029c10be 100644
--- a/merge-ort.c
+++ b/merge-ort.c
@@ -3536,7 +3536,7 @@ simple_cleanup:
 	/* Free memory for renames->pairs[] and combined */
 	for (s = MERGE_SIDE1; s <= MERGE_SIDE2; s++) {
 		free(renames->pairs[s].queue);
-		DIFF_QUEUE_CLEAR(&renames->pairs[s]);
+		diff_queue_init(&renames->pairs[s]);
 	}
 	for (i = 0; i < combined.nr; i++)
 		pool_diff_free_filepair(&opt->priv->pool, combined.queue[i]);