diff --git a/compiler/compiler.go b/compiler/compiler.go
index 0da00b40..a6355cb2 100644
--- a/compiler/compiler.go
+++ b/compiler/compiler.go
@@ -34,6 +34,7 @@ type Config struct {
 	DumpSSA   bool     // dump Go SSA, for compiler debugging
 	Debug     bool     // add debug symbols for gdb
 	RootDir   string   // GOROOT for TinyGo
+	GOPATH    string   // GOPATH, like `go env GOPATH`
 	BuildTags []string // build tags for TinyGo (empty means {runtime.GOOS/runtime.GOARCH})
 }
 
@@ -151,6 +152,15 @@ func (c *Compiler) Module() llvm.Module {
 func (c *Compiler) Compile(mainPath string) error {
 	tripleSplit := strings.Split(c.Triple, "-")
 
+	// Prefix the GOPATH with the system GOROOT, as GOROOT is already set to
+	// the TinyGo root.
+	gopath := c.GOPATH
+	if gopath == "" {
+		gopath = runtime.GOROOT()
+	} else {
+		gopath = runtime.GOROOT() + string(filepath.ListSeparator) + gopath
+	}
+
 	config := loader.Config{
 		TypeChecker: types.Config{
 			Sizes: &StdSizes{
@@ -163,7 +173,7 @@ func (c *Compiler) Compile(mainPath string) error {
 			GOARCH:      tripleSplit[0],
 			GOOS:        tripleSplit[2],
 			GOROOT:      c.RootDir,
-			GOPATH:      runtime.GOROOT(),
+			GOPATH:      gopath,
 			CgoEnabled:  true,
 			UseAllFiles: false,
 			Compiler:    "gc", // must be one of the recognized compilers
diff --git a/main.go b/main.go
index 43f09f7a..9137bc3f 100644
--- a/main.go
+++ b/main.go
@@ -22,6 +22,7 @@ func Compile(pkgName, outpath string, spec *TargetSpec, printIR, dumpSSA, debug
 		Debug:     debug,
 		DumpSSA:   dumpSSA,
 		RootDir:   sourceDir(),
+		GOPATH:    getGopath(),
 		BuildTags: spec.BuildTags,
 	}
 	c, err := compiler.NewCompiler(pkgName, config)
@@ -198,6 +199,7 @@ func Flash(pkgName, target, port string, printIR, dumpSSA, debug bool, printSize
 func Run(pkgName string) error {
 	config := compiler.Config{
 		RootDir: sourceDir(),
+		GOPATH:  getGopath(),
 	}
 	c, err := compiler.NewCompiler(pkgName, config)
 	if err != nil {
diff --git a/target.go b/target.go
index 43a9700d..8f7a44cc 100644
--- a/target.go
+++ b/target.go
@@ -58,3 +58,24 @@ func sourceDir() string {
 	_, path, _, _ := runtime.Caller(0)
 	return filepath.Dir(path)
 }
+
+func getGopath() string {
+	gopath := os.Getenv("GOPATH")
+	if gopath != "" {
+		return gopath
+	}
+
+	// fallback
+	var home string
+	if runtime.GOOS == "windows" {
+		home = os.Getenv("USERPROFILE")
+	} else {
+		home = os.Getenv("HOME")
+	}
+	if home == "" {
+		// This is very unlikely, so panic here.
+		// Not the nicest solution, however.
+		panic("no $HOME or %USERPROFILE% found")
+	}
+	return filepath.Join(home, "go")
+}