diff --git a/ghc/runtime/main/StgOverflow.lc b/ghc/runtime/main/StgOverflow.lc
index a5f4e6132083e00de12a1184d2d85d5fb509a8a3..e792e0a3a09eaf9201049e7f08c9fecad4327a12 100644
--- a/ghc/runtime/main/StgOverflow.lc
+++ b/ghc/runtime/main/StgOverflow.lc
@@ -158,7 +158,7 @@ P_ frame;
 		    /* Urgh.  Two queues.  Merge them. */
 		    P_ tso = (P_) BQ_ENTRIES(updatee_keep);
 
-		    while (TSO_LINK(tso) != Prelude_Z91Z93_closure)
+		    while (TSO_LINK(tso) != PrelBase_Z91Z93_closure)
 			tso = TSO_LINK(tso);
 
 		    TSO_LINK(tso) = (P_) BQ_ENTRIES(updatee_bypass);