diff --git a/slugify.cabal b/slugify.cabal
--- a/slugify.cabal
+++ b/slugify.cabal
@@ -1,5 +1,5 @@
 name:                slugify
-version:             0.1.0.1
+version:             0.1.0.2
 synopsis: Convert text into slugs.
 description: Convert a 'Text' object into a visually pleasant URL component.
 homepage:            https://github.com/hapytex/slugify#readme
diff --git a/src/Text/Slugify.hs b/src/Text/Slugify.hs
--- a/src/Text/Slugify.hs
+++ b/src/Text/Slugify.hs
@@ -48,6 +48,7 @@
 isWordSeparator '\x1f' = True
 isWordSeparator '\x1e' = True
 isWordSeparator '\n' = True
+isWordSeparator '_' = True
 isWordSeparator c = case generalCategory c of
     LineSeparator -> True         -- Zl
     ParagraphSeparator -> True    -- Zp