diff --git a/ghc-heap-view.cabal b/ghc-heap-view.cabal
--- a/ghc-heap-view.cabal
+++ b/ghc-heap-view.cabal
@@ -1,5 +1,5 @@
 Name:                ghc-heap-view
-Version:             0.3.0.2
+Version:             0.3.0.3
 Synopsis:            Extract the heap representation of Haskell values and thunks
 Description:
   This library provides functions to introspect the Haskell heap, for example
@@ -28,7 +28,7 @@
   Exposed-modules: GHC.HeapView 
   Default-Language:    Haskell2010
   Build-depends:
-    base == 4.5.*,
+    base >= 4.5 && < 4.7,
     ghc
   C-Sources: cbits/HeapView.c cbits/HeapViewPrim.cmm
   Hs-source-dirs: src/
diff --git a/src/GHC/HeapView.hs b/src/GHC/HeapView.hs
--- a/src/GHC/HeapView.hs
+++ b/src/GHC/HeapView.hs
@@ -287,6 +287,11 @@
         , fun        :: Box
         , payload    :: [Box]
     } |
+    APStackClosure {
+        info         :: StgInfoTable 
+        , fun        :: Box
+        , payload    :: [Box]
+    } |
     BCOClosure {
         info         :: StgInfoTable 
         , instrs     :: Box
@@ -349,6 +354,7 @@
 allPtrs (BlackholeClosure {..}) = [indirectee]
 allPtrs (APClosure {..}) = fun:payload
 allPtrs (PAPClosure {..}) = fun:payload
+allPtrs (APStackClosure {..}) = fun:payload
 allPtrs (BCOClosure {..}) = [instrs,literals,bcoptrs]
 allPtrs (ArrWordsClosure {..}) = []
 allPtrs (MutArrClosure {..}) = mccPayload
@@ -507,6 +513,9 @@
                 (fromIntegral $ wds !! 2)
                 (fromIntegral $ shiftR (wds !! 2) (wORD_SIZE_IN_BITS `div` 2))
                 (head ptrs) (tail ptrs)
+
+        AP_STACK ->
+            return $ APStackClosure itbl (head ptrs) (tail ptrs)
 
         THUNK_SELECTOR ->
             return $ SelectorClosure itbl (head ptrs)