diff --git a/pkg/moq/importer.go b/pkg/moq/importer.go
index 66c6109..acf1225 100644
--- a/pkg/moq/importer.go
+++ b/pkg/moq/importer.go
@@ -18,6 +18,7 @@ import (
 )
 
 type customImporter struct {
+	source        string
 	imported      map[string]*types.Package
 	base          types.Importer
 	skipTestFiles bool
@@ -43,8 +44,13 @@ func (i *customImporter) Import(path string) (*types.Package, error) {
 	return pkg, nil
 }
 
-func gopathDir(pkg string) (string, error) {
-	for _, gopath := range strings.Split(os.Getenv("GOPATH"), ":") {
+func gopathDir(source, pkg string) (string, error) {
+	// check vendor directory
+	vendorPath, found := vendorPath(source, pkg)
+	if found {
+		return vendorPath, nil
+	}
+	for _, gopath := range gopaths() {
 		absPath, err := filepath.Abs(path.Join(gopath, "src", pkg))
 		if err != nil {
 			return "", err
@@ -53,18 +59,50 @@ func gopathDir(pkg string) (string, error) {
 			return absPath, nil
 		}
 	}
-	return "", fmt.Errorf("%s not in $GOPATH", pkg)
+	return "", fmt.Errorf("%s not in $GOPATH or %s", pkg, path.Join(source, "vendor"))
+}
+
+func vendorPath(source, pkg string) (string, bool) {
+	for {
+		if isGopath(source) {
+			return "", false
+		}
+		vendorPath, err := filepath.Abs(path.Join(source, "vendor", pkg))
+		if err != nil {
+			return "", false
+		}
+		if dir, err := os.Stat(vendorPath); err == nil && dir.IsDir() {
+			return vendorPath, true
+		}
+		source = filepath.Dir(source)
+		if source == "." {
+			return "", false
+		}
+	}
 }
 
 func removeGopath(p string) string {
-	for _, gopath := range strings.Split(os.Getenv("GOPATH"), ":") {
+	for _, gopath := range gopaths() {
 		p = strings.Replace(p, path.Join(gopath, "src")+"/", "", 1)
 	}
 	return p
 }
 
+func gopaths() []string {
+	return strings.Split(os.Getenv("GOPATH"), string(filepath.ListSeparator))
+}
+
+func isGopath(path string) bool {
+	for _, p := range gopaths() {
+		if p == path {
+			return true
+		}
+	}
+	return false
+}
+
 func (i *customImporter) fsPkg(pkg string) (*types.Package, error) {
-	dir, err := gopathDir(pkg)
+	dir, err := gopathDir(i.source, pkg)
 	if err != nil {
 		return importOrErr(i.base, pkg, err)
 	}
@@ -118,8 +156,9 @@ func importOrErr(base types.Importer, pkg string, err error) (*types.Package, er
 }
 
 // newImporter returns an importer that will try to import code from gopath before using go/importer.Default and skipping test files
-func newImporter() types.Importer {
+func newImporter(source string) types.Importer {
 	return &customImporter{
+		source:        source,
 		imported:      make(map[string]*types.Package),
 		base:          importer.Default(),
 		skipTestFiles: true,
@@ -138,8 +177,8 @@ func newImporter() types.Importer {
 // stripGopath teks the directory to a package and remove the gopath to get the
 // cannonical package name
 func stripGopath(p string) string {
-	for _, gopath := range strings.Split(os.Getenv("GOPATH"), ":") {
-		p = strings.Replace(p, path.Join(gopath, "src")+"/", "", 1)
+	for _, gopath := range gopaths() {
+		p = strings.TrimPrefix(p, path.Join(gopath, "src")+"/")
 	}
 	return p
 }
diff --git a/pkg/moq/moq.go b/pkg/moq/moq.go
index c2339ce..a006121 100644
--- a/pkg/moq/moq.go
+++ b/pkg/moq/moq.go
@@ -76,7 +76,7 @@ func (m *Mocker) Mock(w io.Writer, name ...string) error {
 			files[i] = file
 			i++
 		}
-		conf := types.Config{Importer: newImporter()}
+		conf := types.Config{Importer: newImporter(m.src)}
 		tpkg, err := conf.Check(m.src, m.fset, files, nil)
 		if err != nil {
 			return err
diff --git a/pkg/moq/moq_test.go b/pkg/moq/moq_test.go
index bfdab08..d54d70b 100644
--- a/pkg/moq/moq_test.go
+++ b/pkg/moq/moq_test.go
@@ -2,7 +2,6 @@ package moq
 
 import (
 	"bytes"
-	"log"
 	"strings"
 	"testing"
 )
@@ -183,5 +182,14 @@ func TestVendoredPackages(t *testing.T) {
 	if err != nil {
 		t.Errorf("mock error: %s", err)
 	}
-	log.Println(buf.String())
+	s := buf.String()
+	// assertions of things that should be mentioned
+	var strs = []string{
+		`"github.com/matryer/somerepo"`,
+	}
+	for _, str := range strs {
+		if !strings.Contains(s, str) {
+			t.Errorf("expected but missing: \"%s\"", str)
+		}
+	}
 }
diff --git a/pkg/moq/testpackages/vendoring/user/vendor/github.com/matryer/somerepo/code.go b/pkg/moq/testpackages/vendoring/vendor/github.com/matryer/somerepo/code.go
similarity index 100%
rename from pkg/moq/testpackages/vendoring/user/vendor/github.com/matryer/somerepo/code.go
rename to pkg/moq/testpackages/vendoring/vendor/github.com/matryer/somerepo/code.go