diff --git a/Criterion/Main/Options.hs b/Criterion/Main/Options.hs
--- a/Criterion/Main/Options.hs
+++ b/Criterion/Main/Options.hs
@@ -100,16 +100,26 @@
              -- ^ Default configuration to use if options are not
              -- explicitly specified.
           -> Parser Mode
-parseWith cfg =
-    (matchNames (Run <$> config cfg)) <|>
-    runIters <|>
-    (List <$ switch (long "list" <> short 'l' <> help "List benchmarks")) <|>
-    (Version <$ switch (long "version" <> help "Show version info"))
+parseWith cfg = config cfg <**> runMode
+                -- Important: only run `config` once here, as we only want the
+                -- command-line options resulting from `config` to appear once
+                -- in the `--help` output. See #168.
   where
-    runIters = matchNames $
-      RunIters <$> config cfg <*> option auto
-                  (long "iters" <> short 'n' <> metavar "ITERS" <>
-                   help "Run benchmarks, don't analyse")
+    runMode :: Parser (Config -> Mode)
+    runMode =
+      matchNames (pure $ \mt bs cfg' -> Run cfg' mt bs) <|>
+      runIters <|>
+      (const List <$ switch (long "list" <> short 'l' <> help "List benchmarks")) <|>
+      (const Version <$ switch (long "version" <> help "Show version info"))
+
+    runIters :: Parser (Config -> Mode)
+    runIters = matchNames $ (\iters mt bs cfg' -> RunIters cfg' iters mt bs)
+      <$> option auto
+          (long "iters" <> short 'n' <> metavar "ITERS" <>
+           help "Run benchmarks, don't analyse")
+
+    matchNames :: Parser (MatchType -> [String] -> Config -> Mode)
+               -> Parser (Config -> Mode)
     matchNames wat = wat
       <*> option match
           (long "match" <> short 'm' <> metavar "MATCH" <> value Prefix <>
diff --git a/changelog.md b/changelog.md
--- a/changelog.md
+++ b/changelog.md
@@ -1,3 +1,7 @@
+1.2.4.0
+
+* Fix issue where `--help` would display duplicate options
+
 1.2.3.0
 
 * Add a `Semigroup` instance for `Outliers`
diff --git a/criterion.cabal b/criterion.cabal
--- a/criterion.cabal
+++ b/criterion.cabal
@@ -1,5 +1,5 @@
 name:           criterion
-version:        1.2.3.0
+version:        1.2.4.0
 synopsis:       Robust, reliable performance measurement and analysis
 license:        BSD3
 license-file:   LICENSE
@@ -23,7 +23,7 @@
   GHC==7.8.4,
   GHC==7.10.3,
   GHC==8.0.2,
-  GHC==8.2.1
+  GHC==8.2.2
 
 data-files:
   templates/*.css