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-rw-r--r--compiler/prelude/PrelRules.lhs2
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/prelude/PrelRules.lhs b/compiler/prelude/PrelRules.lhs
index 7aeb920e0c..713726288f 100644
--- a/compiler/prelude/PrelRules.lhs
+++ b/compiler/prelude/PrelRules.lhs
@@ -737,7 +737,7 @@ match_append_lit _ [Type ty1,
c1 `cheapEqExpr` c2
= ASSERT( ty1 `eqType` ty2 )
Just (Var unpk `App` Type ty1
- `App` Lit (MachStr (s1 `appendFS` s2))
+ `App` Lit (MachStr (s1 `appendFB` s2))
`App` c1
`App` n)