diff --git a/src/lein_git_version/plugin.clj b/src/lein_git_version/plugin.clj
index 35b2a58..a651019 100644
--- a/src/lein_git_version/plugin.clj
+++ b/src/lein_git_version/plugin.clj
@@ -5,12 +5,13 @@
 
 (defn middleware
   [project]
-  (let [code (str
+  (let [proj-name (clojure.string/replace (:name project) "-" "_")
+        code (str
               ";; Do not edit.  Generated by lein-git-version plugin.\n"
               "(ns " (:name project) ".version)\n"
               "(def version \"" (get-git-version) "\")\n")
         filename (str (first (:source-paths project)) "/"
-                      (:name project) "/version.clj")]
+                      proj-name "/version.clj")]
     (-> project
         (update-in [:injections] concat `[(spit ~filename ~code)])
         (assoc :version (get-git-version)))))