diff --git a/pkg/builder/util.go b/pkg/builder/util.go
index eb75f7fd7..c92093f0d 100644
--- a/pkg/builder/util.go
+++ b/pkg/builder/util.go
@@ -321,18 +321,23 @@ func resolveExporterDest(exporter, dest string) (func(map[string]string) (io.Wri
 func ParseFromStr(fromStr string) (string, string, error) {
 	filename := defaultFile
 	funcname := defaultFunc
-	if strings.Contains(fromStr, ":") {
-		fromArr := strings.Split(fromStr, ":")
-
-		if len(fromArr) != 2 {
-			return "", "", errors.New("invalid from format, expected `file:func`")
-		}
-		if fromArr[0] != "" {
-			filename = fromArr[0]
-		}
-		if fromArr[1] != "" {
-			funcname = fromArr[1]
+	if !strings.Contains(fromStr, ":") {
+		if len(fromStr) > 0 {
+			filename = fromStr
 		}
+		return filename, funcname, nil
+	}
+
+	fromArr := strings.Split(fromStr, ":")
+
+	if len(fromArr) != 2 {
+		return "", "", errors.New("invalid from format, expected `file:func`")
+	}
+	if fromArr[0] != "" {
+		filename = fromArr[0]
+	}
+	if fromArr[1] != "" {
+		funcname = fromArr[1]
 	}
 	return filename, funcname, nil
 }
diff --git a/pkg/builder/util_test.go b/pkg/builder/util_test.go
index 740bb8d4e..b3137db50 100644
--- a/pkg/builder/util_test.go
+++ b/pkg/builder/util_test.go
@@ -193,3 +193,68 @@ func TestParseOutput(t *testing.T) {
 		})
 	}
 }
+
+func TestParseFromStr(t *testing.T) {
+	type testCase struct {
+		name        string
+		from        string
+		expectFile  string
+		expectFunc  string
+		expectError bool
+	}
+
+	testCases := []testCase{
+		{
+			"empty",
+			"",
+			"build.envd",
+			"build",
+			false,
+		},
+		{
+			"without func",
+			"main.envd",
+			"main.envd",
+			"build",
+			false,
+		},
+		{
+			"without func but has :",
+			"test.envd:",
+			"test.envd",
+			"build",
+			false,
+		},
+		{
+			"without file",
+			":test",
+			"build.envd",
+			"test",
+			false,
+		},
+		{
+			"all",
+			"hello.envd:run",
+			"hello.envd",
+			"run",
+			false,
+		},
+		{
+			"more than 2 :",
+			"test.envd:run:foo",
+			"",
+			"",
+			true,
+		},
+	}
+
+	for _, tc := range testCases {
+		file, function, err := ParseFromStr(tc.from)
+		if tc.expectError {
+			require.Error(t, err)
+		} else {
+			require.Equal(t, file, tc.expectFile, tc.name)
+			require.Equal(t, function, tc.expectFunc, tc.name)
+		}
+	}
+}