diff --git a/command.go b/command.go
index 4879cfa0..f21e2dbd 100644
--- a/command.go
+++ b/command.go
@@ -18,6 +18,8 @@ type Cmder interface {
 	Args() []interface{}
 	String() string
 	stringArg(int) string
+	firstKeyPos() int
+	addKeyPos(int)
 
 	readTimeout() *time.Duration
 	readReply(rd *proto.Reader) error
@@ -73,6 +75,9 @@ func cmdFirstKeyPos(cmd Cmder, info *CommandInfo) int {
 		}
 	}
 
+	if pos := cmd.firstKeyPos(); pos != 0 {
+		return pos
+	}
 	if info == nil {
 		return 0
 	}
@@ -106,6 +111,7 @@ type baseCmd struct {
 	ctx  context.Context
 	args []interface{}
 	err  error
+	keyPos int
 
 	_readTimeout *time.Duration
 }
@@ -147,6 +153,14 @@ func (cmd *baseCmd) stringArg(pos int) string {
 	return s
 }
 
+func (cmd *baseCmd) firstKeyPos() int {
+	return cmd.keyPos
+}
+
+func (cmd *baseCmd) addKeyPos(offset int)  {
+	cmd.keyPos += offset
+}
+
 func (cmd *baseCmd) SetErr(e error) {
 	cmd.err = e
 }
diff --git a/commands.go b/commands.go
index 4c7113d2..e70eac4e 100644
--- a/commands.go
+++ b/commands.go
@@ -1504,16 +1504,20 @@ type XReadArgs struct {
 func (c cmdable) XRead(ctx context.Context, a *XReadArgs) *XStreamSliceCmd {
 	args := make([]interface{}, 0, 5+len(a.Streams))
 	args = append(args, "xread")
+
+	offset := 1
 	if a.Count > 0 {
 		args = append(args, "count")
 		args = append(args, a.Count)
+		offset += 2
 	}
 	if a.Block >= 0 {
 		args = append(args, "block")
 		args = append(args, int64(a.Block/time.Millisecond))
+		offset += 2
 	}
-
 	args = append(args, "streams")
+	offset += 1
 	for _, s := range a.Streams {
 		args = append(args, s)
 	}
@@ -1522,6 +1526,7 @@ func (c cmdable) XRead(ctx context.Context, a *XReadArgs) *XStreamSliceCmd {
 	if a.Block >= 0 {
 		cmd.setReadTimeout(a.Block)
 	}
+	cmd.addKeyPos(offset)
 	_ = c(ctx, cmd)
 	return cmd
 }
@@ -1575,16 +1580,22 @@ type XReadGroupArgs struct {
 func (c cmdable) XReadGroup(ctx context.Context, a *XReadGroupArgs) *XStreamSliceCmd {
 	args := make([]interface{}, 0, 8+len(a.Streams))
 	args = append(args, "xreadgroup", "group", a.Group, a.Consumer)
+
+	offset := 1
 	if a.Count > 0 {
 		args = append(args, "count", a.Count)
+		offset += 2
 	}
 	if a.Block >= 0 {
 		args = append(args, "block", int64(a.Block/time.Millisecond))
+		offset += 2
 	}
 	if a.NoAck {
 		args = append(args, "noack")
+		offset += 1
 	}
 	args = append(args, "streams")
+	offset += 1
 	for _, s := range a.Streams {
 		args = append(args, s)
 	}
@@ -1593,6 +1604,7 @@ func (c cmdable) XReadGroup(ctx context.Context, a *XReadGroupArgs) *XStreamSlic
 	if a.Block >= 0 {
 		cmd.setReadTimeout(a.Block)
 	}
+	cmd.addKeyPos(offset)
 	_ = c(ctx, cmd)
 	return cmd
 }
@@ -1871,6 +1883,7 @@ func (c cmdable) ZInterStore(ctx context.Context, destination string, store *ZSt
 		args = append(args, "aggregate", store.Aggregate)
 	}
 	cmd := NewIntCmd(ctx, args...)
+	cmd.addKeyPos(3)
 	_ = c(ctx, cmd)
 	return cmd
 }
@@ -2106,6 +2119,7 @@ func (c cmdable) ZUnionStore(ctx context.Context, dest string, store *ZStore) *I
 		args = append(args, "aggregate", store.Aggregate)
 	}
 	cmd := NewIntCmd(ctx, args...)
+	cmd.addKeyPos(3)
 	_ = c(ctx, cmd)
 	return cmd
 }