diff --git a/src/Haddock/InterfaceFile.hs b/src/Haddock/InterfaceFile.hs
index 924829d7c2be641fa1b3442945162f6a5757a5fb..c8af7bc60fa6cc2a971ecba3f296f0898d1fc12f 100644
--- a/src/Haddock/InterfaceFile.hs
+++ b/src/Haddock/InterfaceFile.hs
@@ -76,7 +76,7 @@ binaryInterfaceMagic = 0xD0Cface
 -- (2) set `binaryInterfaceVersionCompatibility` to [binaryInterfaceVersion]
 --
 binaryInterfaceVersion :: Word16
-#if __GLASGOW_HASKELL__ == 709
+#if __GLASGOW_HASKELL__ == 708
 binaryInterfaceVersion = 25
 
 binaryInterfaceVersionCompatibility :: [Word16]