diff --git a/txsort/txsort.go b/txsort/txsort.go
index b915cb5..9a32036 100644
--- a/txsort/txsort.go
+++ b/txsort/txsort.go
@@ -14,6 +14,23 @@ import (
 	"github.com/btcsuite/btcd/wire"
 )
 
+// InPlaceSort modifies the passed transaction inputs and outputs to be sorted
+// based on BIP LI01.
+//
+// WARNING: This function must NOT be called with published transactions since
+// it will mutate the transaction if it's not already sorted.  This can cause
+// issues if you mutate a tx in a block, for example, which would invalidate the
+// block.  It could also cause cached hashes, such as in a btcutil.Tx to become
+// invalidated.
+//
+// The function should only be used if the caller is creating the transaction or
+// is otherwise 100% positive mutating will not cause adverse affects due to
+// other dependencies.
+func InPlaceSort(tx *wire.MsgTx) {
+	sort.Sort(sortableInputSlice(tx.TxIn))
+	sort.Sort(sortableOutputSlice(tx.TxOut))
+}
+
 // Sort returns a new transaction with the inputs and outputs sorted based on
 // BIP LI01.  The passed transaction is not modified and the new transaction
 // might have a different hash if any sorting was done.
diff --git a/txsort/txsort_test.go b/txsort/txsort_test.go
index ef5db18..bcf6d2b 100644
--- a/txsort/txsort_test.go
+++ b/txsort/txsort_test.go
@@ -110,5 +110,15 @@ func TestSort(t *testing.T) {
 				test.unsortedHash)
 			continue
 		}
+
+		// Now sort the transaction using the mutable version and ensure
+		// the resulting hash is the expected value.
+		txsort.InPlaceSort(&tx)
+		if got := tx.TxSha().String(); got != test.sortedHash {
+			t.Errorf("SortMutate (%s): sorted hash does not match "+
+				"expected - got %v, want %v", test.name, got,
+				test.sortedHash)
+			continue
+		}
 	}
 }