diff --git a/src-3.0/GF/Speech/SRG.hs b/src-3.0/GF/Speech/SRG.hs
index a4a41afb5..8bb509d22 100644
--- a/src-3.0/GF/Speech/SRG.hs
+++ b/src-3.0/GF/Speech/SRG.hs
@@ -8,12 +8,13 @@
 -- FIXME: remove \/ warn \/ fail if there are int \/ string literal
 -- categories in the grammar
 ----------------------------------------------------------------------
-module GF.Speech.SRG (SRG(..), SRGRule(..), SRGAlt(..), SRGItem
+module GF.Speech.SRG (SRG(..), SRGRule(..), SRGAlt(..), SRGItem, SRGSymbol
                      , SRGNT, CFTerm
                      , makeSRG
                      , makeSimpleSRG
                      , makeNonRecursiveSRG
                      , getSpeechLanguage
+                     , isExternalCat
                      , lookupFM_, prtS
                      ) where
 
@@ -139,6 +140,9 @@ cfRulesToSRGRule rs@(r:_) = SRGRule (lhsCat r) rhs
 allSRGCats :: SRG -> [String]
 allSRGCats SRG { srgRules = rs } = [c | SRGRule c _ <- rs]
 
+isExternalCat :: SRG -> Cat -> Bool
+isExternalCat srg c = c `Set.member` srgExternalCats srg
+
 --
 -- * Size-optimized EBNF SRGs
 --
diff --git a/src-3.0/GF/Speech/SRGS_XML.hs b/src-3.0/GF/Speech/SRGS_XML.hs
index a4c07ee05..97c1629fb 100644
--- a/src-3.0/GF/Speech/SRGS_XML.hs
+++ b/src-3.0/GF/Speech/SRGS_XML.hs
@@ -20,7 +20,6 @@ import Data.Char (toUpper,toLower)
 import Data.List
 import Data.Maybe
 import qualified Data.Map as Map
-import qualified Data.Set as Set
 
 srgsXmlPrinter :: Maybe SISRFormat 
                -> PGF -> CId -> String
@@ -39,7 +38,7 @@ prSrgsXml sisr srg = showXMLDoc (optimizeSRGS xmlGr)
                meta "generator" "Grammatical Framework"]
 	    ++ map ruleToXML (srgRules srg)
     ruleToXML (SRGRule cat alts) = Tag "rule" ([("id",cat)]++pub) (prRhs alts)
-        where pub | cat `Set.member` srgExternalCats srg = [("scope","public")]
+        where pub | isExternalCat srg cat = [("scope","public")]
                   | otherwise = []
     prRhs rhss = [oneOf (map (mkProd sisr) rhss)]