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-rw-r--r--mk/config.mk.in2
1 files changed, 1 insertions, 1 deletions
diff --git a/mk/config.mk.in b/mk/config.mk.in
index ae961bbd68..b83fb925dd 100644
--- a/mk/config.mk.in
+++ b/mk/config.mk.in
@@ -404,7 +404,7 @@ endif
# Defer the check until later by using $(if..), because GhcUnregisterised might
# be set in build.mk, which hasn't been read yet.
GhcRTSWays += $(if $(findstring NO, $(GhcUnregisterised)),thr thr_debug thr_l,)
-GhcRTSWays += $(if $(findstring p, $(GhcLibWays)),thr_p,)
+GhcRTSWays += $(if $(findstring p, $(GhcLibWays)),$(if $(findstring NO, $(GhcUnregisterised)),thr_p,),)
# We can only build GHCi threaded if we have a threaded RTS:
GhcThreaded = $(if $(findstring thr,$(GhcRTSWays)),YES,NO)