diff --git a/exe/Arguments.hs b/exe/Arguments.hs
index 7abecdff18..1dcf3e6da0 100644
--- a/exe/Arguments.hs
+++ b/exe/Arguments.hs
@@ -77,7 +77,7 @@ arguments exeName = Arguments
            (short 'j'
           <> help "Number of threads (0: automatic)"
           <> metavar "NUM"
-          <> value 1
+          <> value 0
           <> showDefault
            )