diff --git a/mediantime.go b/mediantime.go
index b11fcd34..1026edc9 100644
--- a/mediantime.go
+++ b/mediantime.go
@@ -118,7 +118,8 @@ func (m *medianTime) AddTimeSample(sourceID string, timeVal time.Time) {
 	// of offsets while respecting the maximum number of allowed entries by
 	// replacing the oldest entry with the new entry once the maximum number
 	// of entries is reached.
-	offsetSecs := int64(time.Now().Sub(timeVal).Seconds())
+	now := time.Unix(time.Now().Unix(), 0)
+	offsetSecs := int64(now.Sub(timeVal).Seconds())
 	numOffsets := len(m.offsets)
 	if numOffsets == maxMedianTimeEntries && maxMedianTimeEntries > 0 {
 		m.offsets = m.offsets[1:]
diff --git a/mediantime_test.go b/mediantime_test.go
index 98e720c7..d191c9c9 100644
--- a/mediantime_test.go
+++ b/mediantime_test.go
@@ -62,8 +62,8 @@ func TestMedianTime(t *testing.T) {
 		filter := btcchain.NewMedianTime()
 		for j, offset := range test.in {
 			id := strconv.Itoa(j)
-			tOffset := time.Now().Add(time.Duration(offset) *
-				time.Second)
+			now := time.Unix(time.Now().Unix(), 0)
+			tOffset := now.Add(time.Duration(offset) * time.Second)
 			filter.AddTimeSample(id, tOffset)
 
 			// Ensure the duplicate IDs are ignored.
@@ -76,11 +76,16 @@ func TestMedianTime(t *testing.T) {
 			}
 		}
 
+		// Since it is possible that the time.Now call in AddTimeSample
+		// and the time.Now calls here in the tests will be off by one
+		// second, allow a fudge factor to compensate.
 		gotOffset := filter.Offset()
 		wantOffset := time.Duration(test.wantOffset) * time.Second
-		if gotOffset != wantOffset {
+		wantOffset2 := time.Duration(test.wantOffset-1) * time.Second
+		if gotOffset != wantOffset && gotOffset != wantOffset2 {
 			t.Errorf("Offset #%d: unexpected offset -- got %v, "+
-				"want %v", i, gotOffset, wantOffset)
+				"want %v or %v", i, gotOffset, wantOffset,
+				wantOffset2)
 			continue
 		}