diff --git a/parser/parser.go b/parser/parser.go
index e5bb2eb0..75b7c500 100644
--- a/parser/parser.go
+++ b/parser/parser.go
@@ -35,6 +35,7 @@ package parser
 
 import (
 	"bytes"
+	"encoding/base64"
 	"errors"
 	"io"
 	"io/ioutil"
@@ -161,6 +162,19 @@ func ParseFileWithSourceMap(fileSet *file.FileSet, filename string, javascriptSo
 		return nil, err
 	}
 
+	if sourcemapSource == nil {
+		lines := bytes.Split(src, []byte("\n"))
+		lastLine := lines[len(lines)-1]
+		if bytes.HasPrefix(lastLine, []byte("//# sourceMappingURL=data:application/json")) {
+			bits := bytes.SplitN(lastLine, []byte(","), 2)
+			if len(bits) == 2 {
+				if d, err := base64.StdEncoding.DecodeString(string(bits[1])); err == nil {
+					sourcemapSource = d
+				}
+			}
+		}
+	}
+
 	sm, err := ReadSourceMap(filename, sourcemapSource)
 	if err != nil {
 		return nil, err
diff --git a/sourcemap_test.go b/sourcemap_test.go
index 93b72a8b..afb82410 100644
--- a/sourcemap_test.go
+++ b/sourcemap_test.go
@@ -8,6 +8,7 @@ const (
 	testSourcemapCodeOriginal  = "function functionA(argA, argB) {\n  functionB(argA, argB);\n}\n\nfunction functionB(argA, argB) {\n  functionExternal(argA, argB);\n}"
 	testSourcemapCodeMangled   = "function functionA(argA,argB){functionB(argA,argB)}function functionB(argA,argB){functionExternal(argA,argB)}"
 	testSourcemapContent       = `{"version":3,"sources":["hello.js"],"names":["functionA","argA","argB","functionB","functionExternal"],"mappings":"AAAA,QAASA,WAAUC,KAAMC,MACvBC,UAAUF,KAAMC,MAGlB,QAASC,WAAUF,KAAMC,MACvBE,iBAAiBH,KAAMC"}`
+	testSourcemapInline        = "function functionA(argA,argB){functionB(argA,argB)}function functionB(argA,argB){functionExternal(argA,argB)}\n//# sourceMappingURL=data:application/json;charset=utf-8;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbImhlbGxvLmpzIl0sIm5hbWVzIjpbImZ1bmN0aW9uQSIsImFyZ0EiLCJhcmdCIiwiZnVuY3Rpb25CIiwiZnVuY3Rpb25FeHRlcm5hbCJdLCJtYXBwaW5ncyI6IkFBQUEsUUFBU0EsV0FBVUMsS0FBTUMsTUFDdkJDLFVBQVVGLEtBQU1DLE1BR2xCLFFBQVNDLFdBQVVGLEtBQU1DLE1BQ3ZCRSxpQkFBaUJILEtBQU1DIn0="
 	testSourcemapOriginalStack = "ReferenceError: 'functionExternal' is not defined\n    at functionB (hello.js:6:3)\n    at functionA (hello.js:2:3)\n    at <anonymous>:1:1\n"
 	testSourcemapMangledStack  = "ReferenceError: 'functionExternal' is not defined\n    at functionB (hello.js:1:82)\n    at functionA (hello.js:1:31)\n    at <anonymous>:1:1\n"
 	testSourcemapMappedStack   = "ReferenceError: 'functionExternal' is not defined\n    at functionB (hello.js:6:2)\n    at functionA (hello.js:2:2)\n    at <anonymous>:1:1\n"
@@ -79,6 +80,28 @@ func TestSourceMapMangledWithSourcemap(t *testing.T) {
 	})
 }
 
+func TestSourceMapMangledWithInlineSourcemap(t *testing.T) {
+	tt(t, func() {
+		vm := New()
+
+		s, err := vm.CompileWithSourceMap("hello.js", testSourcemapInline, nil)
+		if err != nil {
+			panic(err)
+		}
+
+		if _, err := vm.Run(s); err != nil {
+			panic(err)
+		}
+
+		_, err = vm.Run(`functionA()`)
+		if err == nil {
+			panic("error should not be nil")
+		}
+
+		is(err.(*Error).String(), testSourcemapMappedStack)
+	})
+}
+
 func TestSourceMapContextPosition(t *testing.T) {
 	tt(t, func() {
 		vm := New()