diff --git a/cdc/model/changefeed.go b/cdc/model/changefeed.go
index 8e41d090790..8958fc2e163 100644
--- a/cdc/model/changefeed.go
+++ b/cdc/model/changefeed.go
@@ -299,6 +299,12 @@ func (info *ChangeFeedInfo) FixIncompatible() {
 		info.fixMySQLSinkProtocol()
 		log.Info("Fix incompatibility changefeed sink uri completed", zap.String("changefeed", info.String()))
 	}
+
+	if info.Config.MemoryQuota == uint64(0) {
+		log.Info("Start fixing incompatible memory quota", zap.String("changefeed", info.String()))
+		info.fixMemoryQuota()
+		log.Info("Fix incompatible memory quota completed", zap.String("changefeed", info.String()))
+	}
 }
 
 // fixState attempts to fix state loss from upgrading the old owner to the new owner.
@@ -428,3 +434,7 @@ func (info *ChangeFeedInfo) HasFastFailError() bool {
 	}
 	return cerror.IsChangefeedFastFailErrorCode(errors.RFCErrorCode(info.Error.Code))
 }
+
+func (info *ChangeFeedInfo) fixMemoryQuota() {
+	info.Config.FixMemoryQuota()
+}
diff --git a/cdc/model/changefeed_test.go b/cdc/model/changefeed_test.go
index 5c1a5dae443..9164d979daa 100644
--- a/cdc/model/changefeed_test.go
+++ b/cdc/model/changefeed_test.go
@@ -702,6 +702,53 @@ func TestFixMQSinkProtocol(t *testing.T) {
 	}
 }
 
+func TestFixMemoryQuotaIncompatible(t *testing.T) {
+	t.Parallel()
+
+	testCases := []struct {
+		info                *ChangeFeedInfo
+		expectedMemoryQuota uint64
+	}{
+		{
+			info: &ChangeFeedInfo{
+				CreatorVersion: "",
+				SinkURI:        "mysql://root:test@127.0.0.1:3306/",
+				Config: &config.ReplicaConfig{
+					Sink: &config.SinkConfig{Protocol: config.ProtocolDefault.String()},
+				},
+			},
+			expectedMemoryQuota: config.DefaultChangefeedMemoryQuota,
+		},
+		{
+			info: &ChangeFeedInfo{
+				CreatorVersion: "6.5.0",
+				SinkURI:        "mysql://root:test@127.0.0.1:3306/",
+				Config: &config.ReplicaConfig{
+					MemoryQuota: 0,
+					Sink:        &config.SinkConfig{Protocol: config.ProtocolDefault.String()},
+				},
+			},
+			expectedMemoryQuota: config.DefaultChangefeedMemoryQuota,
+		},
+		{
+			info: &ChangeFeedInfo{
+				CreatorVersion: "6.5.0",
+				SinkURI:        "mysql://root:test@127.0.0.1:3306/",
+				Config: &config.ReplicaConfig{
+					MemoryQuota: 10485760,
+					Sink:        &config.SinkConfig{Protocol: config.ProtocolDefault.String()},
+				},
+			},
+			expectedMemoryQuota: 10485760,
+		},
+	}
+
+	for _, tc := range testCases {
+		tc.info.FixIncompatible()
+		require.Equal(t, tc.expectedMemoryQuota, tc.info.Config.MemoryQuota)
+	}
+}
+
 func TestChangeFeedInfoClone(t *testing.T) {
 	t.Parallel()
 
diff --git a/pkg/config/replica_config.go b/pkg/config/replica_config.go
index 2f3bfccc494..91d042e01a1 100644
--- a/pkg/config/replica_config.go
+++ b/pkg/config/replica_config.go
@@ -187,10 +187,18 @@ func (c *ReplicaConfig) ValidateAndAdjust(sinkURI *url.URL) error {
 						minSyncPointRetention.String()))
 		}
 	}
+	if c.MemoryQuota == uint64(0) {
+		c.FixMemoryQuota()
+	}
 
 	return nil
 }
 
+// FixMemoryQuota adjusts memory quota to default value
+func (c *ReplicaConfig) FixMemoryQuota() {
+	c.MemoryQuota = DefaultChangefeedMemoryQuota
+}
+
 // GetSinkURIAndAdjustConfigWithSinkURI parses sinkURI as a URI and adjust config with sinkURI.
 func GetSinkURIAndAdjustConfigWithSinkURI(
 	sinkURIStr string,
diff --git a/pkg/config/replica_config_test.go b/pkg/config/replica_config_test.go
index 506f1b528ea..d5d584e4727 100644
--- a/pkg/config/replica_config_test.go
+++ b/pkg/config/replica_config_test.go
@@ -130,6 +130,18 @@ func TestReplicaConfigValidate(t *testing.T) {
 	require.Equal(t, "d1", rules[0].PartitionRule)
 	require.Equal(t, "p1", rules[1].PartitionRule)
 	require.Equal(t, "", rules[2].PartitionRule)
+
+	// Test memory quota can be adjusted
+	conf = GetDefaultReplicaConfig()
+	conf.MemoryQuota = 0
+	err = conf.ValidateAndAdjust(nil)
+	require.NoError(t, err)
+	require.Equal(t, uint64(DefaultChangefeedMemoryQuota), conf.MemoryQuota)
+
+	conf.MemoryQuota = uint64(1024)
+	err = conf.ValidateAndAdjust(nil)
+	require.NoError(t, err)
+	require.Equal(t, uint64(1024), conf.MemoryQuota)
 }
 
 func TestValidateAndAdjust(t *testing.T) {