diff --git a/logging/mock.go b/logging/mock.go
index b64f63a..66e046e 100644
--- a/logging/mock.go
+++ b/logging/mock.go
@@ -57,12 +57,12 @@ func (m writerMap) CheckWrittenAtLevel(t *testing.T, lv LogLevel, exp string) {
 	} else {
 		w = m[lv]
 	}
-	if len(w.written) < 32 {
+	// 32 bytes covers the date, time and filename up to the colon in
+	// 2011/10/22 10:22:57 log_test.go:<line no>: <level> <log message>
+	if len(w.written) <= 32 {
 		t.Errorf("Not enough bytes logged at level %s:", LogString(lv))
 		t.Errorf("\tgot: %s", string(w.written))
 	}
-	// 32 bytes covers the date, time and filename up to the colon in
-	// 2011/10/22 10:22:57 log_test.go:<line no>: <level> <log message>
 	s := string(w.written[32:])
 	// 2 covers the : itself and the extra space
 	idx := strings.Index(s, ":") + 2