diff --git a/ghc/lib/std/PrelGHC.hi-boot b/ghc/lib/std/PrelGHC.hi-boot
index 460fef058baf411de5f5b9345747bc9fc10c870c..374de3cb60997c6366e187334839427d79a9c1a4 100644
--- a/ghc/lib/std/PrelGHC.hi-boot
+++ b/ghc/lib/std/PrelGHC.hi-boot
@@ -45,6 +45,7 @@ __export PrelGHC
   newMVarzh
   takeMVarzh
   putMVarzh
+  takeMaybeMVarzh
   isEmptyMVarzh
   
   -- Parallel