diff --git a/ghc/lib/std/PrelGHC.hi-boot b/ghc/lib/std/PrelGHC.hi-boot
index 67d494fa884a490f4953e3557bd91d7e24d108eb..52042300b9b0695c8d295b821b1655fe4793fd32 100644
--- a/ghc/lib/std/PrelGHC.hi-boot
+++ b/ghc/lib/std/PrelGHC.hi-boot
@@ -20,6 +20,7 @@ __export PrelGHC
 
   -- constructor tags
   tagToEnumzh
+  getTagzh
   dataToTagzh
 
   -- I/O primitives