diff --git a/example/main.go b/example/main.go
index 5debcec1..6ce0a558 100644
--- a/example/main.go
+++ b/example/main.go
@@ -10,7 +10,8 @@ import (
 	"log"
 	"mime/multipart"
 	"net/http"
-	"os"
+	"path"
+	"runtime"
 	"strings"
 	"sync"
 
@@ -99,6 +100,15 @@ func init() {
 	})
 }
 
+func getBuildDir() string {
+	_, filename, _, ok := runtime.Caller(0)
+	if !ok {
+		panic("Failed to get current frame")
+	}
+
+	return path.Dir(filename)
+}
+
 func main() {
 	// defer profile.Start().Stop()
 	go func() {
@@ -109,7 +119,7 @@ func main() {
 	verbose := flag.Bool("v", false, "verbose")
 	bs := binds{}
 	flag.Var(&bs, "bind", "bind to")
-	certPath := flag.String("certpath", os.Getenv("GOPATH")+"/src/github.com/lucas-clemente/quic-go/example/", "certificate directory")
+	certPath := flag.String("certpath", getBuildDir(), "certificate directory")
 	www := flag.String("www", "/var/www", "www data")
 	tcp := flag.Bool("tcp", false, "also listen on TCP")
 	flag.Parse()
diff --git a/h2quic/server_test.go b/h2quic/server_test.go
index 12b88365..4df2d081 100644
--- a/h2quic/server_test.go
+++ b/h2quic/server_test.go
@@ -33,9 +33,6 @@ func (s *mockSession) RemoteAddr() *net.UDPAddr {
 }
 
 var _ = Describe("H2 server", func() {
-	certPath := os.Getenv("GOPATH")
-	certPath += "/src/github.com/lucas-clemente/quic-go/example/"
-
 	var (
 		s          *Server
 		session    *mockSession
@@ -243,7 +240,7 @@ var _ = Describe("H2 server", func() {
 	})
 
 	It("should error when ListenAndServeTLS is called with s.Server nil", func() {
-		err := (&Server{}).ListenAndServeTLS(certPath+"fullchain.pem", certPath+"privkey.pem")
+		err := (&Server{}).ListenAndServeTLS(testdata.GetCertificatePaths())
 		Expect(err).To(MatchError("use of h2quic.Server without http.Server"))
 	})
 
@@ -296,7 +293,7 @@ var _ = Describe("H2 server", func() {
 			for i := 0; i < 2; i++ {
 				go func() {
 					defer GinkgoRecover()
-					err := s.ListenAndServeTLS(certPath+"fullchain.pem", certPath+"privkey.pem")
+					err := s.ListenAndServeTLS(testdata.GetCertificatePaths())
 					if err != nil {
 						cErr <- err
 					}
@@ -325,7 +322,8 @@ var _ = Describe("H2 server", func() {
 		c, err := net.ListenUDP("udp", udpAddr)
 		Expect(err).NotTo(HaveOccurred())
 		defer c.Close()
-		err = ListenAndServeQUIC(addr, certPath+"fullchain.pem", certPath+"privkey.pem", nil)
+		fullpem, privkey := testdata.GetCertificatePaths()
+		err = ListenAndServeQUIC(addr, fullpem, privkey, nil)
 		// Check that it's an EADDRINUSE
 		Expect(err).ToNot(BeNil())
 		opErr, ok := err.(*net.OpError)
diff --git a/qerr/errorcodes_test.go b/qerr/errorcodes_test.go
index 63bf487d..f8cde224 100644
--- a/qerr/errorcodes_test.go
+++ b/qerr/errorcodes_test.go
@@ -4,7 +4,8 @@ import (
 	"go/ast"
 	"go/parser"
 	"go/token"
-	"os"
+	"path"
+	"runtime"
 	"strconv"
 
 	. "github.com/onsi/ginkgo"
@@ -16,7 +17,11 @@ var _ = Describe("error codes", func() {
 	It("has a string representation for every error code", func() {
 		// We parse the error code file, extract all constants, and verify that
 		// each of them has a string version. Go FTW!
-		filename := os.Getenv("GOPATH") + "/src/github.com/lucas-clemente/quic-go/qerr/error_codes.go"
+		_, thisfile, _, ok := runtime.Caller(0)
+		if !ok {
+			panic("Failed to get current frame")
+		}
+		filename := path.Join(path.Dir(thisfile), "error_codes.go")
 		fileAst, err := parser.ParseFile(token.NewFileSet(), filename, nil, 0)
 		Expect(err).NotTo(HaveOccurred())
 		constSpecs := fileAst.Decls[0].(*ast.GenDecl).Specs
diff --git a/testdata/cert.go b/testdata/cert.go
index a82ff049..fcc85df8 100644
--- a/testdata/cert.go
+++ b/testdata/cert.go
@@ -2,19 +2,30 @@ package testdata
 
 import (
 	"crypto/tls"
-	"os"
+	"path"
+	"runtime"
 )
 
 var certPath string
 
 func init() {
-	certPath = os.Getenv("GOPATH")
-	certPath += "/src/github.com/lucas-clemente/quic-go/example"
+	_, filename, _, ok := runtime.Caller(0)
+	if !ok {
+		panic("Failed to get current frame")
+	}
+
+	certPath = path.Join(path.Dir(path.Dir(filename)), "example")
+}
+
+// GetCertificatePaths returns the paths to 'fullchain.pem' and 'privkey.pem' for the
+// quic.clemente.io cert.
+func GetCertificatePaths() (string, string) {
+	return path.Join(certPath, "fullchain.pem"), path.Join(certPath, "privkey.pem")
 }
 
 // GetTLSConfig returns a tls config for quic.clemente.io
 func GetTLSConfig() *tls.Config {
-	cert, err := tls.LoadX509KeyPair(certPath+"/fullchain.pem", certPath+"/privkey.pem")
+	cert, err := tls.LoadX509KeyPair(GetCertificatePaths())
 	if err != nil {
 		panic(err)
 	}
@@ -25,7 +36,7 @@ func GetTLSConfig() *tls.Config {
 
 // GetCertificate returns a certificate for quic.clemente.io
 func GetCertificate() tls.Certificate {
-	cert, err := tls.LoadX509KeyPair(certPath+"/fullchain.pem", certPath+"/privkey.pem")
+	cert, err := tls.LoadX509KeyPair(GetCertificatePaths())
 	if err != nil {
 		panic(err)
 	}