diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,5 +1,8 @@
 # Changelog for ghc-lib-parser-ex
 
+## 8.10.0.6 released 2020-05-05
+- Bugfix in `parsePragmasIntoDynFlags` that meant that default enabled/disabled extensions subsequently disabled/enabled via pragma weren't getting disabled/enabled
+
 ## 8.10.0.5 released 2020-05-02
 - New modules
   - `Language.Haskell.GhclibParserEx.GHC.Parser`, `Language.Haskell.GhcLibParserEx.GHC.Utils.Outputable` to replace `Language.Haskell.GhclibParserEx.Parse` and `Language.Haskell.GhclibParserEx.Outputable` (which remain for now but deprecated and will be removed in a future release)
diff --git a/ghc-lib-parser-ex.cabal b/ghc-lib-parser-ex.cabal
--- a/ghc-lib-parser-ex.cabal
+++ b/ghc-lib-parser-ex.cabal
@@ -1,6 +1,6 @@
 cabal-version: >= 1.18
 name:           ghc-lib-parser-ex
-version:        8.10.0.5
+version:        8.10.0.6
 description:    Please see the README on GitHub at <https://github.com/shayne-fletcher/ghc-lib-parser-ex#readme>
 homepage:       https://github.com/shayne-fletcher/ghc-lib-parser-ex#readme
 bug-reports:    https://github.com/shayne-fletcher/ghc-lib-parser-ex/issues
diff --git a/src/Language/Haskell/GhclibParserEx/GHC/Driver/Session.hs b/src/Language/Haskell/GhclibParserEx/GHC/Driver/Session.hs
--- a/src/Language/Haskell/GhclibParserEx/GHC/Driver/Session.hs
+++ b/src/Language/Haskell/GhclibParserEx/GHC/Driver/Session.hs
@@ -154,10 +154,12 @@
 parsePragmasIntoDynFlags flags (enable, disable) file str =
   catchErrors $ do
     let opts = getOptions flags (stringToStringBuffer str) file
-    (flags, _, _) <- parseDynamicFilePragma flags opts
+    -- Important : apply enables, disables *before* parsing dynamic
+    -- file pragmas.
     let flags' =  foldl' xopt_set flags enable
     let flags'' = foldl' xopt_unset flags' disable
-    return $ Right (flags'' `gopt_set` Opt_KeepRawTokenStream)
+    (flags, _, _) <- parseDynamicFilePragma flags'' opts
+    return $ Right (flags `gopt_set` Opt_KeepRawTokenStream)
   where
     catchErrors :: IO (Either String DynFlags) -> IO (Either String DynFlags)
     catchErrors act = handleGhcException reportErr