diff --git a/cli/command/formatter/image.go b/cli/command/formatter/image.go
index d24bf50947ce..6182fe027c1c 100644
--- a/cli/command/formatter/image.go
+++ b/cli/command/formatter/image.go
@@ -246,7 +246,7 @@ func (c *imageContext) CreatedAt() string {
 }
 
 func (c *imageContext) Size() string {
-	return units.HumanSizeWithPrecision(float64(c.i.Size), 3)
+	return units.HumanSize(float64(c.i.Size))
 }
 
 func (c *imageContext) Containers() string {
diff --git a/opts/hosts.go b/opts/hosts.go
index dcbbb7e78166..26624d1e2c45 100644
--- a/opts/hosts.go
+++ b/opts/hosts.go
@@ -57,7 +57,14 @@ func parseDockerDaemonHost(addr string) (string, error) {
 	proto, host, hasProto := strings.Cut(addr, "://")
 	if !hasProto && proto != "" {
 		host = proto
-		proto = "tcp"
+		// If the address looks like a filesystem path, default to "unix"
+		// rather than "tcp" to avoid confusing errors when the user sets
+		// DOCKER_HOST=/path/to/sock without a unix:// prefix.
+		if strings.HasPrefix(host, "/") || strings.HasPrefix(host, "./") {
+			proto = "unix"
+		} else {
+			proto = "tcp"
+		}
 	}
 
 	switch proto {
diff --git a/opts/hosts_test.go b/opts/hosts_test.go
index 28f4eb6fab9e..36eff9a2d8de 100644
--- a/opts/hosts_test.go
+++ b/opts/hosts_test.go
@@ -79,6 +79,8 @@ func TestParseDockerDaemonHost(t *testing.T) {
 		"unix://":                     "unix://" + defaultUnixSocket,
 		"fd://":                       "fd://",
 		"fd://something":              "fd://something",
+		"/var/run/docker.sock":        "unix:///var/run/docker.sock",
+		"./run/docker.sock":           "unix://run/docker.sock",
 		"localhost:":                  "tcp://localhost:2375",
 		"localhost:5555":              "tcp://localhost:5555",
 		"localhost:5555/path":         "tcp://localhost:5555/path",