diff --git a/base/commands/migration/estimate.go b/base/commands/migration/estimate.go
index ecd4a5a0..8dde2888 100644
--- a/base/commands/migration/estimate.go
+++ b/base/commands/migration/estimate.go
@@ -6,6 +6,7 @@ import (
 	"context"
 	"fmt"
 
+	"github.com/hazelcast/hazelcast-commandline-client/clc/paths"
 	"github.com/hazelcast/hazelcast-commandline-client/clc/ux/stage"
 	"github.com/hazelcast/hazelcast-commandline-client/internal/check"
 	"github.com/hazelcast/hazelcast-commandline-client/internal/plug"
@@ -27,8 +28,12 @@ func (e EstimateCmd) Exec(ctx context.Context, ec plug.ExecContext) error {
 	ec.PrintlnUnnecessary(fmt.Sprintf(`%s
 
 Estimation usually ends within 15 seconds.`, banner))
+	conf := ec.GetStringArg(argDMTConfig)
+	if !paths.Exists(conf) {
+		return fmt.Errorf("migration config does not exist: %s", conf)
+	}
 	mID := MakeMigrationID()
-	stages, err := NewEstimateStages(ec.Logger(), mID, ec.GetStringArg(argDMTConfig))
+	stages, err := NewEstimateStages(ec.Logger(), mID, conf)
 	if err != nil {
 		return err
 	}
diff --git a/base/commands/migration/estimate_it_test.go b/base/commands/migration/estimate_it_test.go
index b21da4fc..5779197d 100644
--- a/base/commands/migration/estimate_it_test.go
+++ b/base/commands/migration/estimate_it_test.go
@@ -25,7 +25,7 @@ func TestEstimate(t *testing.T) {
 		wg.Add(1)
 		go func() {
 			defer wg.Done()
-			check.Must(tcx.CLC().Execute(ctx, "estimate", "testdata/dmt-config"))
+			check.Must(tcx.CLC().Execute(ctx, "estimate", "testdata/dmt_config"))
 		}()
 		c := make(chan string)
 		go findEstimationID(ctx, tcx, c)
diff --git a/base/commands/migration/migration_start.go b/base/commands/migration/migration_start.go
index 84368199..499b1eae 100644
--- a/base/commands/migration/migration_start.go
+++ b/base/commands/migration/migration_start.go
@@ -4,8 +4,10 @@ package migration
 
 import (
 	"context"
+	"fmt"
 
 	"github.com/hazelcast/hazelcast-commandline-client/clc"
+	"github.com/hazelcast/hazelcast-commandline-client/clc/paths"
 	"github.com/hazelcast/hazelcast-commandline-client/clc/ux/stage"
 	clcerrors "github.com/hazelcast/hazelcast-commandline-client/errors"
 	"github.com/hazelcast/hazelcast-commandline-client/internal/check"
@@ -41,6 +43,10 @@ func (StartCmd) Exec(ctx context.Context, ec plug.ExecContext) (err error) {
 	
 Selected data structures in the source cluster will be migrated to the target cluster.	
 `)
+	conf := ec.GetStringArg(argDMTConfig)
+	if !paths.Exists(conf) {
+		return fmt.Errorf("migration config does not exist: %s", conf)
+	}
 	if !ec.Props().GetBool(clc.FlagAutoYes) {
 		p := prompt.New(ec.Stdin(), ec.Stdout())
 		yes, err := p.YesNo("Proceed?")
@@ -59,7 +65,7 @@ Selected data structures in the source cluster will be migrated to the target cl
 			err = finalizeErr
 		}
 	}()
-	sts, err := NewStartStages(ec.Logger(), mID, ec.GetStringArg(argDMTConfig))
+	sts, err := NewStartStages(ec.Logger(), mID, conf)
 	if err != nil {
 		return err
 	}
diff --git a/base/commands/migration/start_stages_it_test.go b/base/commands/migration/start_stages_it_test.go
index a1634de4..07334100 100644
--- a/base/commands/migration/start_stages_it_test.go
+++ b/base/commands/migration/start_stages_it_test.go
@@ -67,7 +67,7 @@ func startMigrationTest(t *testing.T, expectedErr error, statusMapStateFiles []s
 		var execErr error
 		go tcx.WithReset(func() {
 			defer wg.Done()
-			execErr = tcx.CLC().Execute(ctx, "start", "testdata/dmt-config", "--yes", "-o", outDir)
+			execErr = tcx.CLC().Execute(ctx, "start", "testdata/dmt_config", "--yes", "-o", outDir)
 		})
 		c := make(chan string)
 		go findMigrationID(ctx, tcx, c)