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-rw-r--r--src/Text/Pandoc/Readers/Odt/ContentReader.hs3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/Text/Pandoc/Readers/Odt/ContentReader.hs b/src/Text/Pandoc/Readers/Odt/ContentReader.hs
index 1f1c57646..8c475eefc 100644
--- a/src/Text/Pandoc/Readers/Odt/ContentReader.hs
+++ b/src/Text/Pandoc/Readers/Odt/ContentReader.hs
@@ -61,6 +61,7 @@ import Text.Pandoc.Readers.Odt.Generic.XMLConverter
import Text.Pandoc.Readers.Odt.Generic.Fallible
import Text.Pandoc.Readers.Odt.Generic.Utils
+import qualified Data.Set as Set
--------------------------------------------------------------------------------
-- State
@@ -221,7 +222,7 @@ getPrettyAnchor = proc (baseIdent, uglyAnchor) -> do
getHeaderAnchor :: OdtReaderSafe Inlines Anchor
getHeaderAnchor = proc title -> do
state <- getExtraState -< ()
- let anchor = uniqueIdent (toList title) (usedAnchors state)
+ let anchor = uniqueIdent (toList title) (Set.fromList $ usedAnchors state)
modifyExtraState (putPrettyAnchor anchor anchor) -<< anchor