diff --git a/partition/gpt/table.go b/partition/gpt/table.go
index 132b3578..5d62311b 100644
--- a/partition/gpt/table.go
+++ b/partition/gpt/table.go
@@ -295,7 +295,7 @@ func (t *Table) toGPTBytes(primary bool) ([]byte, error) {
 	copy(b[56:72], bytesToUUIDBytes(guid[0:16]))
 
 	// starting LBA of array of partition entries
-	binary.LittleEndian.PutUint64(b[72:80], t.partitionArraySector(true))
+	binary.LittleEndian.PutUint64(b[72:80], t.partitionArraySector(primary))
 
 	// how many entries?
 	binary.LittleEndian.PutUint32(b[80:84], uint32(t.partitionArraySize))