diff --git a/ghc/driver/ghc.lprl b/ghc/driver/ghc.lprl
index 8e4b16f2b32d68e1744de85403bc18521cc0d8ba..8f7cb9eee4c78555f90c369bd3f389f3bcaf818f 100644
--- a/ghc/driver/ghc.lprl
+++ b/ghc/driver/ghc.lprl
@@ -2634,7 +2634,7 @@ sub add_syslib {
 	       ? "$InstLibDirGhc"
 	       : "$TopPwd/hslibs/util/cbits"
 	  )
-	, 'lang concurrent' # Syslib dependencies
+	, 'lang concurrent posix' # Syslib dependencies
 	, ''     # extra ghc opts
 	, ''     # extra cc opts
 	, ''     # extra ld opts