diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9529e6b..07605ab 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,9 @@
   1087](https://github.com/tweag/ormolu/issues/1087).
 * Improve comment placement in if-then-else blocks. [Issue
   998](https://github.com/tweag/ormolu/issues/998).
+* Now command line options for fixity overrides and module re-exports
+  overwrite information from `.ormolu` files. [Issue
+  1030](https://github.com/tweag/ormolu/issues/1030).
 
 ## Ormolu 0.7.3.0
 
diff --git a/app/Main.hs b/app/Main.hs
index a44765c..9765391 100644
--- a/app/Main.hs
+++ b/app/Main.hs
@@ -168,15 +168,17 @@ formatOne ConfigFileOpts {..} mode reqSourceType rawConfig mpath =
             fromMaybe
               ModuleSource
               (reqSourceType <|> mdetectedSourceType)
-      let mfixityOverrides = fst <$> mdotOrmolu
-          mmoduleReexports = snd <$> mdotOrmolu
       return $
         refineConfig
           sourceType
           mcabalInfo
-          mfixityOverrides
-          mmoduleReexports
-          rawConfig
+          (Just (cfgFixityOverrides rawConfig))
+          (Just (cfgModuleReexports rawConfig))
+          ( rawConfig
+              { cfgFixityOverrides = maybe defaultFixityOverrides fst mdotOrmolu,
+                cfgModuleReexports = maybe defaultModuleReexports snd mdotOrmolu
+              }
+          )
     handleDiff originalInput formattedInput fileRepr =
       case diffText originalInput formattedInput fileRepr of
         Nothing -> return ExitSuccess
diff --git a/fixity-tests/default.nix b/fixity-tests/default.nix
index bb4c8f9..be9a420 100644
--- a/fixity-tests/default.nix
+++ b/fixity-tests/default.nix
@@ -16,6 +16,8 @@
       ormolu --check-idempotence --mode inplace --no-cabal --no-dot-ormolu --fixity 'infixr 8 .=' --fixity 'infixr 5 :>' test-0-with-fixity-info-manual.hs
       cp test-0-input.hs test-0-with-fixity-info-dotormolu.hs
       ormolu --check-idempotence --mode inplace --no-cabal -p base test-0-with-fixity-info-dotormolu.hs
+      cp test-0-input.hs test-0-cli-overrides-dotormolu.hs
+      ormolu --check-idempotence --mode inplace --no-cabal -p base --fixity 'infixr 5 .=' test-0-cli-overrides-dotormolu.hs
       cp test-1-input.hs test-1-no-extra-info.hs
       ormolu --check-idempotence --mode inplace --no-cabal --no-dot-ormolu test-1-no-extra-info.hs
       cp test-1-input.hs test-1-with-fixity-info-manual.hs
@@ -33,11 +35,13 @@
     '';
     checkPhase = ''
       echo test-0-no-extra-info.hs
-      diff --color=always test-0-no-extra-info-expected.hs test-0-no-extra-info.hs
+      diff --color=always test-0-ugly-expected.hs test-0-no-extra-info.hs
       echo test-0-with-fixity-info-manual.hs
       diff --color=always test-0-with-fixity-info-expected.hs test-0-with-fixity-info-manual.hs
       echo test-0-with-fixity-info-dotormolu.hs
       diff --color=always test-0-with-fixity-info-expected.hs test-0-with-fixity-info-dotormolu.hs
+      echo test-0-cli-overrides-dotormolu.hs
+      diff --color=always test-0-ugly-expected.hs test-0-cli-overrides-dotormolu.hs
       echo test-1-no-extra-info.hs
       diff --color=always test-1-no-extra-info-expected.hs test-1-no-extra-info.hs
       echo test-1-with-fixity-info-manual.hs
diff --git a/fixity-tests/test-0-no-extra-info-expected.hs b/fixity-tests/test-0-ugly-expected.hs
similarity index 100%
rename from fixity-tests/test-0-no-extra-info-expected.hs
rename to fixity-tests/test-0-ugly-expected.hs