diff --git a/head.go b/head.go
index 00f51e0077..82a3459bd1 100644
--- a/head.go
+++ b/head.go
@@ -249,9 +249,6 @@ func (h *Head) ReadWAL() error {
 func (h *Head) Truncate(mint int64) error {
 	initialize := h.MinTime() == math.MinInt64
 
-	if mint%h.chunkRange != 0 {
-		return errors.Errorf("truncating at %d not aligned", mint)
-	}
 	if h.MinTime() >= mint {
 		return nil
 	}
diff --git a/head_test.go b/head_test.go
index b7603e78ee..31713b9c1c 100644
--- a/head_test.go
+++ b/head_test.go
@@ -187,8 +187,8 @@ func TestHead_Truncate(t *testing.T) {
 	}
 	s4.chunks = []*memChunk{}
 
-	// Truncation must be aligned.
-	require.Error(t, h.Truncate(1))
+	// Truncation need not be aligned.
+	require.NoError(t, h.Truncate(1))
 
 	h.Truncate(2000)