diff --git a/cabal.project b/cabal.project
new file mode 100644
index 0000000..9ebd695
--- /dev/null
+++ b/cabal.project
@@ -0,0 +1,7 @@
+packages: .
+
+
+source-repository-package
+    type: git
+    location: git@github.com:Qqwy/haskell-primitive-unlifted.git
+    tag: 784fc78815a695db6db69c729a364663e4f0afe2
diff --git a/src/Control/Monad/ST/Run.hs b/src/Control/Monad/ST/Run.hs
index ca66dd2..ecbeb7b 100644
--- a/src/Control/Monad/ST/Run.hs
+++ b/src/Control/Monad/ST/Run.hs
@@ -10,6 +10,7 @@ module Control.Monad.ST.Run
   , runSmallArrayST
   , runByteArrayST
   , runPrimArrayST
+  , runSmallUnliftedArrayST
   , runUnliftedArrayST
 
     -- * Integral Types
@@ -47,6 +48,7 @@ import Data.Primitive.ByteArray (ByteArray (ByteArray))
 import Data.Primitive.PrimArray (PrimArray (PrimArray))
 import Data.Primitive.SmallArray (SmallArray (SmallArray))
 import Data.Primitive.Unlifted.Array (UnliftedArray_ (UnliftedArray))
+import Data.Primitive.Unlifted.SmallArray (SmallUnliftedArray_ (SmallUnliftedArray))
 import GHC.Exts (Char (C#), Double (D#), Float (F#), Int (I#), Word (W#), runRW#)
 import GHC.Int (Int16 (I16#), Int32 (I32#), Int8 (I8#))
 import GHC.ST (ST (ST))
@@ -72,6 +74,10 @@ runUnliftedArrayST :: (forall s. ST s (UnliftedArray_ unlifted_a a)) -> Unlifted
 {-# INLINE runUnliftedArrayST #-}
 runUnliftedArrayST f = UnliftedArray (runRW# (\s0 -> case f of ST g -> case g s0 of (# _, UnliftedArray r #) -> r))
 
+runSmallUnliftedArrayST :: (forall s. ST s (SmallUnliftedArray_ unlifted_a a)) -> SmallUnliftedArray_ unlifted_a a
+{-# INLINE runSmallUnliftedArrayST #-}
+runSmallUnliftedArrayST f = SmallUnliftedArray (runRW# (\s0 -> case f of ST g -> case g s0 of (# _, SmallUnliftedArray r #) -> r))
+
 runCharST :: (forall s. ST s Char) -> Char
 {-# INLINE runCharST #-}
 runCharST f = C# (runRW# (\s0 -> case f of ST g -> case g s0 of (# _, C# r #) -> r))