diff --git a/promql/parser/printer.go b/promql/parser/printer.go
index 0b6368ed2..c5f80eb0b 100644
--- a/promql/parser/printer.go
+++ b/promql/parser/printer.go
@@ -116,8 +116,10 @@ func (node *MatrixSelector) String() string {
 	// Copy the Vector selector before changing the offset
 	vecSelector := *node.VectorSelector.(*VectorSelector)
 	offset := ""
-	if vecSelector.OriginalOffset != time.Duration(0) {
+	if vecSelector.OriginalOffset > time.Duration(0) {
 		offset = fmt.Sprintf(" offset %s", model.Duration(vecSelector.OriginalOffset))
+	} else if vecSelector.OriginalOffset < time.Duration(0) {
+		offset = fmt.Sprintf(" offset -%s", model.Duration(-vecSelector.OriginalOffset))
 	}
 	at := ""
 	if vecSelector.Timestamp != nil {
@@ -147,8 +149,10 @@ func (node *SubqueryExpr) String() string {
 		step = model.Duration(node.Step).String()
 	}
 	offset := ""
-	if node.OriginalOffset != time.Duration(0) {
+	if node.OriginalOffset > time.Duration(0) {
 		offset = fmt.Sprintf(" offset %s", model.Duration(node.OriginalOffset))
+	} else if node.OriginalOffset < time.Duration(0) {
+		offset = fmt.Sprintf(" offset -%s", model.Duration(-node.OriginalOffset))
 	}
 	at := ""
 	if node.Timestamp != nil {
@@ -187,8 +191,10 @@ func (node *VectorSelector) String() string {
 		labelStrings = append(labelStrings, matcher.String())
 	}
 	offset := ""
-	if node.OriginalOffset != time.Duration(0) {
+	if node.OriginalOffset > time.Duration(0) {
 		offset = fmt.Sprintf(" offset %s", model.Duration(node.OriginalOffset))
+	} else if node.OriginalOffset < time.Duration(0) {
+		offset = fmt.Sprintf(" offset -%s", model.Duration(-node.OriginalOffset))
 	}
 	at := ""
 	if node.Timestamp != nil {
diff --git a/promql/parser/printer_test.go b/promql/parser/printer_test.go
index 850026a68..1ad48c3d4 100644
--- a/promql/parser/printer_test.go
+++ b/promql/parser/printer_test.go
@@ -77,12 +77,18 @@ func TestExprString(t *testing.T) {
 		{
 			in: `a offset 1m`,
 		},
+		{
+			in: `a offset -7m`,
+		},
 		{
 			in: `a{c="d"}[5m] offset 1m`,
 		},
 		{
 			in: `a[5m] offset 1m`,
 		},
+		{
+			in: `a[12m] offset -3m`,
+		},
 		{
 			in: `a[1h:5m] offset 1m`,
 		},