diff --git a/shake-bench/src/Development/Benchmark/Rules.hs b/shake-bench/src/Development/Benchmark/Rules.hs
index 10d54f3cde..92f5c13f63 100644
--- a/shake-bench/src/Development/Benchmark/Rules.hs
+++ b/shake-bench/src/Development/Benchmark/Rules.hs
@@ -307,7 +307,7 @@ benchRules build MkBenchRules{..} = do
         let exePath    = build </> "binaries" </> ver </> executableName
             exeExtraArgs =
                 [ "+RTS"
-                , "-l-au"
+                , "-l"
                 , "-S" <> outGc]
              ++ concat
                 [[ "-h"