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-rw-r--r--src/GF/Command/Importing.hs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/GF/Command/Importing.hs b/src/GF/Command/Importing.hs
index c3ad9d746..390eda5b0 100644
--- a/src/GF/Command/Importing.hs
+++ b/src/GF/Command/Importing.hs
@@ -26,6 +26,7 @@ importGrammar pgf0 opts files =
".pgf" -> do
pgf2 <- mapM readPGF files >>= return . foldl1 unionPGF
return $ unionPGF pgf0 pgf2
+ ext -> die $ "Unknown filename extension: " ++ show ext
importSource :: SourceGrammar -> Options -> [FilePath] -> IO SourceGrammar
importSource src0 opts files = do