diff --git a/redis/command_type.go b/redis/command_type.go
index 0bd85d3..c0c7576 100644
--- a/redis/command_type.go
+++ b/redis/command_type.go
@@ -53,7 +53,7 @@ var replicaSafe = makeSet(strings.Split(
 		"SCARD SDIFF SINTER SISMEMBER SMEMBERS SRANDMEMBER STRLEN SUNION "+
 		"ZCARD ZCOUNT ZLEXCOUNT ZRANGE ZRANGEBYLEX ZREVRANGEBYLEX "+
 		"ZRANGEBYSCORE ZRANK ZREVRANGE ZREVRANGEBYSCORE ZREVRANK ZSCORE "+
-		"XPENDING XREVRANGE XREAD XLEN ", " "))
+		"XPENDING XREVRANGE XREAD XLEN FCALL_RO", " "))
 
 // ReplicaSafe returns true if command is readonly and "safe to run on replica".
 // Some commands like "scan" are not included, because their result could differ between
diff --git a/redis/request.go b/redis/request.go
index cd94898..33cf255 100644
--- a/redis/request.go
+++ b/redis/request.go
@@ -41,6 +41,8 @@ func (r Request) Key() (string, bool) {
 	}
 	var n int
 	switch r.Cmd {
+	case "FCALL", "FCALL_RO":
+		n = 2
 	case "EVAL", "EVALSHA":
 		n = 2
 	case "BITOP":
@@ -63,6 +65,8 @@ func (r Request) KeyByte() ([]byte, bool) {
 	}
 	var n int
 	switch r.Cmd {
+	case "FCALL", "FCALL_RO":
+		n = 2
 	case "EVAL", "EVALSHA":
 		n = 2
 	case "BITOP":
diff --git a/redis/request_test.go b/redis/request_test.go
index 8437937..6a41f40 100644
--- a/redis/request_test.go
+++ b/redis/request_test.go
@@ -34,11 +34,59 @@ func TestRequestKey(t *testing.T) {
 	assert.Equal(t, "2", k)
 	assert.True(t, ok)
 
+	k, ok = Req("FCALL", "foo", 1, 2, 3).Key()
+	assert.Equal(t, "2", k)
+	assert.True(t, ok)
+
+	k, ok = Req("FCALL_RO", "foo", 1, 2, 3).Key()
+	assert.Equal(t, "2", k)
+	assert.True(t, ok)
+
 	k, ok = Req("BITOP", "AND", 1, 2).Key()
 	assert.Equal(t, "1", k)
 	assert.True(t, ok)
 }
 
+func TestRequestKeyByte(t *testing.T) {
+	var k []byte
+	var ok bool
+
+	k, ok = Req("GET", 1).KeyByte()
+	assert.Equal(t, []byte("1"), k)
+	assert.True(t, ok)
+
+	_, ok = Req("GET").Key()
+	assert.False(t, ok)
+
+	k, ok = Req("SET", 1, 2).KeyByte()
+	assert.Equal(t, []byte("1"), k)
+	assert.True(t, ok)
+
+	k, ok = Req("RANDOMKEY").KeyByte()
+	assert.Equal(t, []byte("RANDOMKEY"), k)
+	assert.False(t, ok)
+
+	k, ok = Req("EVAL", "return KEY[1]", 1, 2, 3).KeyByte()
+	assert.Equal(t, []byte("2"), k)
+	assert.True(t, ok)
+
+	k, ok = Req("EVALSHA", "1234abcdef", 1, 2, 3).KeyByte()
+	assert.Equal(t, []byte("2"), k)
+	assert.True(t, ok)
+
+	k, ok = Req("FCALL", "foo", 1, 2, 3).KeyByte()
+	assert.Equal(t, []byte("2"), k)
+	assert.True(t, ok)
+
+	k, ok = Req("FCALL_RO", "foo", 1, 2, 3).KeyByte()
+	assert.Equal(t, []byte("2"), k)
+	assert.True(t, ok)
+
+	k, ok = Req("BITOP", "AND", 1, 2).KeyByte()
+	assert.Equal(t, []byte("1"), k)
+	assert.True(t, ok)
+}
+
 func TestArgToString(t *testing.T) {
 	var k string
 	var ok bool