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-rw-r--r--src/Text/Pandoc/Readers/Markdown.hs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/Text/Pandoc/Readers/Markdown.hs b/src/Text/Pandoc/Readers/Markdown.hs
index dcf7f1b1a..69011bc56 100644
--- a/src/Text/Pandoc/Readers/Markdown.hs
+++ b/src/Text/Pandoc/Readers/Markdown.hs
@@ -1705,7 +1705,7 @@ citeKey = try $ do
char '@'
first <- letter
let internal p = try $ p >>~ lookAhead (letter <|> digit)
- rest <- many $ letter <|> digit <|> internal (oneOf ":.#$%&-_?<>~/")
+ rest <- many $ letter <|> digit <|> internal (oneOf ":.#$%&-_+?<>~/")
let key = first:rest
citations' <- map CSL.refId <$> getOption readerReferences
guard $ key `elem` citations'