diff --git a/ghc/compiler/Makefile b/ghc/compiler/Makefile
index fcb24afcf56aedf2c264f3b1969ef1bf5e4d0ef0..3fae31f96086487fb2bd48c0951e97dde0f7d7bc 100644
--- a/ghc/compiler/Makefile
+++ b/ghc/compiler/Makefile
@@ -408,7 +408,7 @@ SRC_HC_OPTS += -DGHCI -package template-haskell
 PKG_DEPENDS += template-haskell
 
 # Use threaded RTS with GHCi, so threads don't get blocked at the prompt.
-# SRC_HC_OPTS += -threaded
+SRC_HC_OPTS += -threaded
 
 ALL_DIRS += ghci