diff --git a/options.go b/options.go
index 2e4f1a4..9bed3e0 100644
--- a/options.go
+++ b/options.go
@@ -80,7 +80,15 @@ func (opts *Options) init() error {
 // Load loads the canonicalized URL's content.
 type ImportResolver interface {
 	CanonicalizeURL(url string) (string, error)
-	Load(canonicalizedURL string) (string, error)
+	Load(canonicalizedURL string) (Import, error)
+}
+
+type Import struct {
+	// The content of the imported file.
+	Content string
+
+	// The syntax of the imported file.
+	SourceSyntax SourceSyntax
 }
 
 // Args holds the arguments to Execute.
diff --git a/transpiler.go b/transpiler.go
index fdd8cdb..0f14959 100644
--- a/transpiler.go
+++ b/transpiler.go
@@ -361,7 +361,8 @@ func (t *Transpiler) input() {
 		case *embeddedsass.OutboundMessage_ImportRequest_:
 			call := t.getCall(compilationID)
 			url := c.ImportRequest.GetUrl()
-			contents, loadErr := call.importResolver.Load(url)
+			imp, loadErr := call.importResolver.Load(url)
+			sourceSyntax := embeddedsass.Syntax_value[string(imp.SourceSyntax)]
 
 			var response *embeddedsass.InboundMessage_ImportResponse
 			var sourceMapURL string
@@ -385,8 +386,9 @@ func (t *Transpiler) input() {
 					Id: c.ImportRequest.GetId(),
 					Result: &embeddedsass.InboundMessage_ImportResponse_Success{
 						Success: &embeddedsass.InboundMessage_ImportResponse_ImportSuccess{
-							Contents:     contents,
+							Contents:     imp.Content,
 							SourceMapUrl: &sourceMapURL,
+							Syntax:       embeddedsass.Syntax(sourceSyntax),
 						},
 					},
 				}
diff --git a/transpiler_test.go b/transpiler_test.go
index f91415e..999cc12 100644
--- a/transpiler_test.go
+++ b/transpiler_test.go
@@ -36,8 +36,9 @@ const (
 )
 
 type testImportResolver struct {
-	name    string
-	content string
+	name         string
+	content      string
+	sourceSyntax godartsass.SourceSyntax
 
 	failOnCanonicalizeURL bool
 	failOnLoad            bool
@@ -54,14 +55,15 @@ func (t testImportResolver) CanonicalizeURL(url string) (string, error) {
 	return "file:/my" + t.name + "/scss/" + url + "_myfile.scss", nil
 }
 
-func (t testImportResolver) Load(url string) (string, error) {
+func (t testImportResolver) Load(url string) (godartsass.Import, error) {
 	if t.failOnLoad {
-		return "", errors.New("failed")
+		return godartsass.Import{}, errors.New("failed")
 	}
 	if !strings.Contains(url, t.name) {
 		panic("protocol error")
 	}
-	return t.content, nil
+	return godartsass.Import{Content: t.content, SourceSyntax: t.sourceSyntax}, nil
+
 }
 
 func TestTranspilerVariants(t *testing.T) {
@@ -72,6 +74,15 @@ func TestTranspilerVariants(t *testing.T) {
 		content: `$white:    #ffff`,
 	}
 
+	resolverIndented := testImportResolver{
+		name: "main",
+		content: `
+#main
+    color: blue		
+`,
+		sourceSyntax: godartsass.SourceSyntaxSASS,
+	}
+
 	for _, test := range []struct {
 		name   string
 		opts   godartsass.Options
@@ -93,6 +104,7 @@ body
 			SourceSyntax: godartsass.SourceSyntaxSASS,
 		}, godartsass.Result{CSS: "body{font:100% Helvetica,sans-serif;color:#333}"}},
 		{"Import resolver with source map", godartsass.Options{}, godartsass.Args{Source: "@import \"colors\";\ndiv { p { color: $white; } }", EnableSourceMap: true, ImportResolver: colorsResolver}, godartsass.Result{CSS: "div p {\n  color: white;\n}", SourceMap: "{\"version\":3,\"sourceRoot\":\"\",\"sources\":[\"data:;charset=utf-8,@import%20%22colors%22;%0Adiv%20%7B%20p%20%7B%20color:%20$white;%20%7D%20%7D\",\"file:///mycolors/scss/colors_myfile.scss\"],\"names\":[],\"mappings\":\"AACM;EAAI,OCDC\"}"}},
+		{"Import resolver with indented source syntax", godartsass.Options{}, godartsass.Args{Source: "@import \"main\";\n", ImportResolver: resolverIndented}, godartsass.Result{CSS: "#main {\n  color: blue;\n}"}},
 
 		// Error cases
 		{"Invalid syntax", godartsass.Options{}, godartsass.Args{Source: "div { color: $white; }"}, false},