diff --git a/cli-plugins/manager/error.go b/cli-plugins/manager/error.go
index 1ad2867869..11822d660c 100644
--- a/cli-plugins/manager/error.go
+++ b/cli-plugins/manager/error.go
@@ -25,6 +25,11 @@ func (e *pluginError) Cause() error {
 	return e.cause
 }
 
+// Unwrap provides compatibility for Go 1.13 error chains.
+func (e *pluginError) Unwrap() error {
+	return e.cause
+}
+
 // MarshalText marshalls the pluginError into a textual form.
 func (e *pluginError) MarshalText() (text []byte, err error) {
 	return []byte(e.cause.Error()), nil
diff --git a/cli-plugins/manager/error_test.go b/cli-plugins/manager/error_test.go
index bc318251ba..fbdb57fd4d 100644
--- a/cli-plugins/manager/error_test.go
+++ b/cli-plugins/manager/error_test.go
@@ -16,7 +16,7 @@ func TestPluginError(t *testing.T) {
 	inner := fmt.Errorf("testing")
 	err = wrapAsPluginError(inner, "wrapping")
 	assert.Error(t, err, "wrapping: testing")
-	assert.Equal(t, inner, errors.Cause(err))
+	assert.Assert(t, errors.Is(err, inner))
 
 	actual, err := yaml.Marshal(err)
 	assert.NilError(t, err)
diff --git a/cli/config/config_test.go b/cli/config/config_test.go
index bf41d6328f..19d0129519 100644
--- a/cli/config/config_test.go
+++ b/cli/config/config_test.go
@@ -80,7 +80,7 @@ func TestEmptyFile(t *testing.T) {
 	assert.NilError(t, err)
 
 	_, err = Load(tmpHome)
-	assert.Equal(t, errors.Cause(err), io.EOF)
+	assert.Assert(t, errors.Is(err, io.EOF))
 	assert.ErrorContains(t, err, ConfigFileName)
 }