diff --git a/src/preserves.nim b/src/preserves.nim
index cb6e1c9..6cf9fef 100644
--- a/src/preserves.nim
+++ b/src/preserves.nim
@@ -317,6 +317,10 @@ proc initSequence*(len: Natural = 0; E = void): Preserve[E] =
   ## Create a Preserves sequence value.
   Preserve[E](kind: pkSequence, sequence: newSeq[Preserve[E]](len))
 
+proc initSequenceOfCap*(cap: Natural; E = void): Preserve[E] =
+  ## Create a Preserves sequence value.
+  Preserve[E](kind: pkSequence, sequence: newSeqOfCap[Preserve[E]](cap))
+
 proc initSet*(E = void): Preserve[E] = Preserve[E](kind: pkSet)
   ## Create a Preserves set value.