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-rw-r--r--compiler/GHC/Hs/Lit.hs2
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/GHC/Hs/Lit.hs b/compiler/GHC/Hs/Lit.hs
index a529b138fb..4ceaac4264 100644
--- a/compiler/GHC/Hs/Lit.hs
+++ b/compiler/GHC/Hs/Lit.hs
@@ -223,7 +223,7 @@ instance Ord OverLitVal where
compare (HsFractional f1) (HsFractional f2) = f1 `compare` f2
compare (HsFractional _) (HsIntegral _) = GT
compare (HsFractional _) (HsIsString _ _) = LT
- compare (HsIsString _ s1) (HsIsString _ s2) = s1 `compare` s2
+ compare (HsIsString _ s1) (HsIsString _ s2) = s1 `uniqCompareFS` s2
compare (HsIsString _ _) (HsIntegral _) = GT
compare (HsIsString _ _) (HsFractional _) = GT