diff --git a/lib/XMonad/Internal/Theme.hs b/lib/XMonad/Internal/Theme.hs
index 24ca508..377142b 100644
--- a/lib/XMonad/Internal/Theme.hs
+++ b/lib/XMonad/Internal/Theme.hs
@@ -193,4 +193,5 @@ promptTheme fb = P.def
   , P.promptBorderWidth = 1
   , P.height            = 35
   , P.position          = P.CenteredAt 0.5 0.5
+  , P.historySize       = 0
   }