diff --git a/builtin/get-tar-commit-id.c b/builtin/get-tar-commit-id.c
index 6d9a79f9b3..cd3e656828 100644
--- a/builtin/get-tar-commit-id.c
+++ b/builtin/get-tar-commit-id.c
@@ -26,7 +26,7 @@ int cmd_get_tar_commit_id(int argc, const char **argv, const char *prefix)
 		usage(builtin_get_tar_commit_id_usage);
 
 	n = read_in_full(0, buffer, HEADERSIZE);
-	if (n < HEADERSIZE)
+	if (n != HEADERSIZE)
 		die("git get-tar-commit-id: read error");
 	if (header->typeflag[0] != 'g')
 		return 1;
diff --git a/csum-file.c b/csum-file.c
index a172199e44..2adae04073 100644
--- a/csum-file.c
+++ b/csum-file.c
@@ -19,7 +19,7 @@ static void flush(struct sha1file *f, const void *buf, unsigned int count)
 
 		if (ret < 0)
 			die_errno("%s: sha1 file read error", f->name);
-		if (ret < count)
+		if (ret != count)
 			die("%s: sha1 file truncated", f->name);
 		if (memcmp(buf, check_buffer, count))
 			die("sha1 file '%s' validation error", f->name);
diff --git a/pkt-line.c b/pkt-line.c
index 647bbd3bce..93ea311443 100644
--- a/pkt-line.c
+++ b/pkt-line.c
@@ -258,7 +258,7 @@ static int get_packet_data(int fd, char **src_buf, size_t *src_size,
 	}
 
 	/* And complain if we didn't get enough bytes to satisfy the read. */
-	if (ret < size) {
+	if (ret != size) {
 		if (options & PACKET_READ_GENTLE_ON_EOF)
 			return -1;