diff --git a/attr.c b/attr.c
index 98eb636f13..f8f6faa94f 100644
--- a/attr.c
+++ b/attr.c
@@ -35,8 +35,7 @@ static struct git_attr *(git_attr_hash[HASHSIZE]);
 
 static unsigned hash_name(const char *name, int namelen)
 {
-	unsigned val = 0;
-	unsigned char c;
+	unsigned val = 0, c;
 
 	while (namelen--) {
 		c = *name++;
diff --git a/base85.c b/base85.c
index b88270f908..b417a15bbc 100644
--- a/base85.c
+++ b/base85.c
@@ -91,7 +91,7 @@ void encode_85(char *buf, const unsigned char *data, int bytes)
 		unsigned acc = 0;
 		int cnt;
 		for (cnt = 24; cnt >= 0; cnt -= 8) {
-			int ch = *data++;
+			unsigned ch = *data++;
 			acc |= ch << cnt;
 			if (--bytes == 0)
 				break;
diff --git a/builtin-pack-objects.c b/builtin-pack-objects.c
index 9742b45c4d..941cc2d73c 100644
--- a/builtin-pack-objects.c
+++ b/builtin-pack-objects.c
@@ -653,8 +653,7 @@ static void rehash_objects(void)
 
 static unsigned name_hash(const char *name)
 {
-	unsigned char c;
-	unsigned hash = 0;
+	unsigned c, hash = 0;
 
 	if (!name)
 		return 0;
diff --git a/builtin-unpack-objects.c b/builtin-unpack-objects.c
index 9a773239ca..8e831be476 100644
--- a/builtin-unpack-objects.c
+++ b/builtin-unpack-objects.c
@@ -422,8 +422,8 @@ static void unpack_delta_entry(enum object_type type, unsigned long delta_size,
 static void unpack_one(unsigned nr)
 {
 	unsigned shift;
-	unsigned char *pack, c;
-	unsigned long size;
+	unsigned char *pack;
+	unsigned long size, c;
 	enum object_type type;
 
 	obj_list[nr].offset = consumed_bytes;
diff --git a/delta.h b/delta.h
index 40ccf5a1e9..b9d333dd5a 100644
--- a/delta.h
+++ b/delta.h
@@ -90,12 +90,11 @@ static inline unsigned long get_delta_hdr_size(const unsigned char **datap,
 					       const unsigned char *top)
 {
 	const unsigned char *data = *datap;
-	unsigned char cmd;
-	unsigned long size = 0;
+	unsigned long cmd, size = 0;
 	int i = 0;
 	do {
 		cmd = *data++;
-		size |= (cmd & ~0x80) << i;
+		size |= (cmd & 0x7f) << i;
 		i += 7;
 	} while (cmd & 0x80 && data < top);
 	*datap = data;
diff --git a/index-pack.c b/index-pack.c
index 6e93ee6af6..0c92bafcbb 100644
--- a/index-pack.c
+++ b/index-pack.c
@@ -293,8 +293,8 @@ static void *unpack_entry_data(unsigned long offset, unsigned long size)
 
 static void *unpack_raw_entry(struct object_entry *obj, union delta_base *delta_base)
 {
-	unsigned char *p, c;
-	unsigned long size;
+	unsigned char *p;
+	unsigned long size, c;
 	off_t base_offset;
 	unsigned shift;
 	void *data;
@@ -312,7 +312,7 @@ static void *unpack_raw_entry(struct object_entry *obj, union delta_base *delta_
 		p = fill(1);
 		c = *p;
 		use(1);
-		size += (c & 0x7fUL) << shift;
+		size += (c & 0x7f) << shift;
 		shift += 7;
 	}
 	obj->size = size;
diff --git a/patch-delta.c b/patch-delta.c
index ed9db81fa8..ef748ce96d 100644
--- a/patch-delta.c
+++ b/patch-delta.c
@@ -44,7 +44,7 @@ void *patch_delta(const void *src_buf, unsigned long src_size,
 			if (cmd & 0x01) cp_off = *data++;
 			if (cmd & 0x02) cp_off |= (*data++ << 8);
 			if (cmd & 0x04) cp_off |= (*data++ << 16);
-			if (cmd & 0x08) cp_off |= (*data++ << 24);
+			if (cmd & 0x08) cp_off |= ((unsigned) *data++ << 24);
 			if (cmd & 0x10) cp_size = *data++;
 			if (cmd & 0x20) cp_size |= (*data++ << 8);
 			if (cmd & 0x40) cp_size |= (*data++ << 16);
diff --git a/sha1_file.c b/sha1_file.c
index e73cd4fc0b..8f5fe62d54 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -1162,8 +1162,7 @@ unsigned long unpack_object_header_buffer(const unsigned char *buf,
 		unsigned long len, enum object_type *type, unsigned long *sizep)
 {
 	unsigned shift;
-	unsigned char c;
-	unsigned long size;
+	unsigned long size, c;
 	unsigned long used = 0;
 
 	c = buf[used++];