diff --git a/cpu_test.go b/cpu_test.go
index 15b6705..202ff36 100644
--- a/cpu_test.go
+++ b/cpu_test.go
@@ -11,7 +11,7 @@ func TestCpu_times(t *testing.T) {
 		t.Errorf("error %v", err)
 	}
 	if len(v) == 0 {
-		t.Errorf("could not get CPUs ", err)
+		t.Error("could not get CPUs ", err)
 	}
 	empty := CPUTimesStat{}
 	for _, vv := range v {
diff --git a/process_posix.go b/process_posix.go
index e52fed3..03bd5d8 100644
--- a/process_posix.go
+++ b/process_posix.go
@@ -41,7 +41,9 @@ func getTerminalMap() (map[uint64]string, error) {
 
 	for _, name := range termfiles {
 		stat := syscall.Stat_t{}
-		syscall.Stat(name, &stat)
+		if err = syscall.Stat(name, &stat); err != nil {
+			return nil, err
+		}
 		rdev := uint64(stat.Rdev)
 		ret[rdev] = strings.Replace(name, "/dev", "", -1)
 	}