diff --git a/snowball.cabal b/snowball.cabal
--- a/snowball.cabal
+++ b/snowball.cabal
@@ -1,5 +1,5 @@
 name          : snowball
-version       : 0.1.0.1
+version       : 0.1.0.2
 homepage      : http://hub.darcs.net/dag/snowball
 category      : Natural Language Processing, Text
 maintainer    : dag.odenhall@gmail.com
diff --git a/src/Text/Snowball.hs b/src/Text/Snowball.hs
--- a/src/Text/Snowball.hs
+++ b/src/Text/Snowball.hs
@@ -68,16 +68,16 @@
 
 data Stemmer
 
-foreign import ccall "libstemmer.h sb_stemmer_new"
+foreign import ccall unsafe "libstemmer.h sb_stemmer_new"
     sb_stemmer_new :: CString -> CString -> IO (Ptr Stemmer)
 
-foreign import ccall "libstemmer.h sb_stemmer_delete"
+foreign import ccall unsafe "libstemmer.h sb_stemmer_delete"
     sb_stemmer_delete :: Ptr Stemmer -> IO ()
 
-foreign import ccall "libstemmer.h sb_stemmer_stem"
+foreign import ccall unsafe "libstemmer.h sb_stemmer_stem"
     sb_stemmer_stem :: Ptr Stemmer -> CString -> CInt -> IO (CString)
 
-foreign import ccall "libstemmer.h sb_stemmer_length"
+foreign import ccall unsafe "libstemmer.h sb_stemmer_length"
     sb_stemmer_length :: Ptr Stemmer -> IO CInt
 
 withStemmer :: Algorithm -> (Ptr Stemmer -> IO a) -> IO a