diff --git a/api.go b/api.go
index 8772994e47..1970feaec6 100644
--- a/api.go
+++ b/api.go
@@ -170,7 +170,7 @@ func getContainersExport(srv *Server, version float64, w http.ResponseWriter, r
 	name := vars["name"]
 
 	if err := srv.ContainerExport(name, w); err != nil {
-		utils.Debugf("%s", err.Error())
+		utils.Debugf("%s", err)
 		return err
 	}
 	return nil
@@ -306,7 +306,7 @@ func postCommit(srv *Server, version float64, w http.ResponseWriter, r *http.Req
 	}
 	config := &Config{}
 	if err := json.NewDecoder(r.Body).Decode(config); err != nil {
-		utils.Debugf("%s", err.Error())
+		utils.Debugf("%s", err)
 	}
 	repo := r.Form.Get("repo")
 	tag := r.Form.Get("tag")
diff --git a/archive_test.go b/archive_test.go
index bb4235ad5b..9a0a8e1b9e 100644
--- a/archive_test.go
+++ b/archive_test.go
@@ -16,7 +16,7 @@ func TestCmdStreamLargeStderr(t *testing.T) {
 	cmd := exec.Command("/bin/sh", "-c", "dd if=/dev/zero bs=1k count=1000 of=/dev/stderr; echo hello")
 	out, err := CmdStream(cmd)
 	if err != nil {
-		t.Fatalf("Failed to start command: " + err.Error())
+		t.Fatalf("Failed to start command: %s", err)
 	}
 	errCh := make(chan error)
 	go func() {
@@ -26,7 +26,7 @@ func TestCmdStreamLargeStderr(t *testing.T) {
 	select {
 	case err := <-errCh:
 		if err != nil {
-			t.Fatalf("Command should not have failed (err=%s...)", err.Error()[:100])
+			t.Fatalf("Command should not have failed (err=%.100s...)", err)
 		}
 	case <-time.After(5 * time.Second):
 		t.Fatalf("Command did not complete in 5 seconds; probable deadlock")
@@ -37,12 +37,12 @@ func TestCmdStreamBad(t *testing.T) {
 	badCmd := exec.Command("/bin/sh", "-c", "echo hello; echo >&2 error couldn\\'t reverse the phase pulser; exit 1")
 	out, err := CmdStream(badCmd)
 	if err != nil {
-		t.Fatalf("Failed to start command: " + err.Error())
+		t.Fatalf("Failed to start command: %s", err)
 	}
 	if output, err := ioutil.ReadAll(out); err == nil {
 		t.Fatalf("Command should have failed")
 	} else if err.Error() != "exit status 1: error couldn't reverse the phase pulser\n" {
-		t.Fatalf("Wrong error value (%s)", err.Error())
+		t.Fatalf("Wrong error value (%s)", err)
 	} else if s := string(output); s != "hello\n" {
 		t.Fatalf("Command output should be '%s', not '%s'", "hello\\n", output)
 	}
diff --git a/auth/auth_test.go b/auth/auth_test.go
index 8e7adaef8d..d036de7364 100644
--- a/auth/auth_test.go
+++ b/auth/auth_test.go
@@ -68,6 +68,6 @@ func TestCreateAccount(t *testing.T) {
 	expectedError := "Login: Account is not Active"
 
 	if !strings.Contains(err.Error(), expectedError) {
-		t.Fatalf("Expected message \"%s\" but found \"%s\" instead", expectedError, err.Error())
+		t.Fatalf("Expected message \"%s\" but found \"%s\" instead", expectedError, err)
 	}
 }
diff --git a/server.go b/server.go
index 4e30ad6c5d..4a37a92684 100644
--- a/server.go
+++ b/server.go
@@ -29,7 +29,7 @@ func (srv *Server) DockerVersion() APIVersion {
 func (srv *Server) ContainerKill(name string) error {
 	if container := srv.runtime.Get(name); container != nil {
 		if err := container.Kill(); err != nil {
-			return fmt.Errorf("Error restarting container %s: %s", name, err.Error())
+			return fmt.Errorf("Error restarting container %s: %s", name, err)
 		}
 	} else {
 		return fmt.Errorf("No such container: %s", name)
@@ -809,7 +809,7 @@ func (srv *Server) ContainerCreate(config *Config) (string, error) {
 func (srv *Server) ContainerRestart(name string, t int) error {
 	if container := srv.runtime.Get(name); container != nil {
 		if err := container.Restart(t); err != nil {
-			return fmt.Errorf("Error restarting container %s: %s", name, err.Error())
+			return fmt.Errorf("Error restarting container %s: %s", name, err)
 		}
 	} else {
 		return fmt.Errorf("No such container: %s", name)
@@ -828,7 +828,7 @@ func (srv *Server) ContainerDestroy(name string, removeVolume bool) error {
 			volumes[volumeId] = struct{}{}
 		}
 		if err := srv.runtime.Destroy(container); err != nil {
-			return fmt.Errorf("Error destroying container %s: %s", name, err.Error())
+			return fmt.Errorf("Error destroying container %s: %s", name, err)
 		}
 
 		if removeVolume {
@@ -948,7 +948,7 @@ func (srv *Server) ImageDelete(name string, autoPrune bool) ([]APIRmi, error) {
 	}
 	if !autoPrune {
 		if err := srv.runtime.graph.Delete(img.ID); err != nil {
-			return nil, fmt.Errorf("Error deleting image %s: %s", name, err.Error())
+			return nil, fmt.Errorf("Error deleting image %s: %s", name, err)
 		}
 		return nil, nil
 	}
@@ -996,7 +996,7 @@ func (srv *Server) ImageGetCached(imgID string, config *Config) (*Image, error)
 func (srv *Server) ContainerStart(name string, hostConfig *HostConfig) error {
 	if container := srv.runtime.Get(name); container != nil {
 		if err := container.Start(hostConfig); err != nil {
-			return fmt.Errorf("Error starting container %s: %s", name, err.Error())
+			return fmt.Errorf("Error starting container %s: %s", name, err)
 		}
 	} else {
 		return fmt.Errorf("No such container: %s", name)
@@ -1007,7 +1007,7 @@ func (srv *Server) ContainerStart(name string, hostConfig *HostConfig) error {
 func (srv *Server) ContainerStop(name string, t int) error {
 	if container := srv.runtime.Get(name); container != nil {
 		if err := container.Stop(t); err != nil {
-			return fmt.Errorf("Error stopping container %s: %s", name, err.Error())
+			return fmt.Errorf("Error stopping container %s: %s", name, err)
 		}
 	} else {
 		return fmt.Errorf("No such container: %s", name)