diff --git a/builtin/diff.c b/builtin/diff.c
index 74351a5..9f61092 100644
--- a/builtin/diff.c
+++ b/builtin/diff.c
@@ -103,7 +103,7 @@
 			      int argc, const char **argv,
 			      struct object_array_entry **blob)
 {
-	unsigned mode = canon_mode(S_IFREG | 0644);
+	const unsigned mode = canon_mode(S_IFREG | 0644);
 
 	if (argc > 1)
 		usage(builtin_diff_usage);
diff --git a/builtin/pack-objects.c b/builtin/pack-objects.c
index 68e2e66..a9fac7c 100644
--- a/builtin/pack-objects.c
+++ b/builtin/pack-objects.c
@@ -1902,10 +1902,10 @@
 {
 	const struct object_entry *a = *(struct object_entry **)_a;
 	const struct object_entry *b = *(struct object_entry **)_b;
-	enum object_type a_type = oe_type(a);
-	enum object_type b_type = oe_type(b);
-	unsigned long a_size = SIZE(a);
-	unsigned long b_size = SIZE(b);
+	const enum object_type a_type = oe_type(a);
+	const enum object_type b_type = oe_type(b);
+	const unsigned long a_size = SIZE(a);
+	const unsigned long b_size = SIZE(b);
 
 	if (a_type > b_type)
 		return -1;
@@ -1920,7 +1920,7 @@
 	if (a->preferred_base < b->preferred_base)
 		return 1;
 	if (use_delta_islands) {
-		int island_cmp = island_delta_cmp(&a->idx.oid, &b->idx.oid);
+		const int island_cmp = island_delta_cmp(&a->idx.oid, &b->idx.oid);
 		if (island_cmp)
 			return island_cmp;
 	}
@@ -2167,7 +2167,7 @@
 	struct object_entry *child = DELTA_CHILD(me);
 	unsigned int m = n;
 	while (child) {
-		unsigned int c = check_delta_limit(child, n + 1);
+		const unsigned int c = check_delta_limit(child, n + 1);
 		if (m < c)
 			m = c;
 		child = DELTA_SIBLING(child);
@@ -2222,7 +2222,7 @@
 		while (window_memory_limit &&
 		       mem_usage > window_memory_limit &&
 		       count > 1) {
-			uint32_t tail = (idx + window - count) % window;
+			const uint32_t tail = (idx + window - count) % window;
 			mem_usage -= free_unpacked(array + tail);
 			count--;
 		}
diff --git a/builtin/pack-redundant.c b/builtin/pack-redundant.c
index cf9a9aa..11bc514 100644
--- a/builtin/pack-redundant.c
+++ b/builtin/pack-redundant.c
@@ -166,7 +166,7 @@
 	l = (hint == NULL) ? list->front : hint;
 	prev = NULL;
 	while (l) {
-		int cmp = oidcmp(l->oid, oid);
+		const int cmp = oidcmp(l->oid, oid);
 		if (cmp > 0) /* not in list, since sorted */
 			return prev;
 		if (!cmp) { /* found */
@@ -264,7 +264,7 @@
 	while (p1_off < p1->pack->num_objects * p1_step &&
 	       p2_off < p2->pack->num_objects * p2_step)
 	{
-		int cmp = hashcmp(p1_base + p1_off, p2_base + p2_off);
+		const int cmp = hashcmp(p1_base + p1_off, p2_base + p2_off);
 		/* cmp ~ p1 - p2 */
 		if (cmp == 0) {
 			p1_hint = llist_sorted_remove(p1->unique_objects,
diff --git a/pack-revindex.c b/pack-revindex.c
index 3c58784..50891f7 100644
--- a/pack-revindex.c
+++ b/pack-revindex.c
@@ -119,7 +119,7 @@
  */
 static void create_pack_revindex(struct packed_git *p)
 {
-	unsigned num_ent = p->num_objects;
+	const unsigned num_ent = p->num_objects;
 	unsigned i;
 	const char *index = p->index_data;
 	const unsigned hashsz = the_hash_algo->rawsz;
@@ -132,7 +132,7 @@
 			(uint32_t *)(index + 8 + p->num_objects * (hashsz + 4));
 		const uint32_t *off_64 = off_32 + p->num_objects;
 		for (i = 0; i < num_ent; i++) {
-			uint32_t off = ntohl(*off_32++);
+			const uint32_t off = ntohl(*off_32++);
 			if (!(off & 0x80000000)) {
 				p->revindex[i].offset = off;
 			} else {
@@ -143,7 +143,7 @@
 		}
 	} else {
 		for (i = 0; i < num_ent; i++) {
-			uint32_t hl = *((uint32_t *)(index + (hashsz + 4) * i));
+			const uint32_t hl = *((uint32_t *)(index + (hashsz + 4) * i));
 			p->revindex[i].offset = ntohl(hl);
 			p->revindex[i].nr = i;
 		}
@@ -168,10 +168,10 @@
 {
 	int lo = 0;
 	int hi = p->num_objects + 1;
-	struct revindex_entry *revindex = p->revindex;
+	const struct revindex_entry *revindex = p->revindex;
 
 	do {
-		unsigned mi = lo + (hi - lo) / 2;
+		const unsigned mi = lo + (hi - lo) / 2;
 		if (revindex[mi].offset == ofs) {
 			return mi;
 		} else if (ofs < revindex[mi].offset)