diff --git a/src/stencil/model/common.clj b/src/stencil/model/common.clj
index 94ac3026..3d3c1377 100644
--- a/src/stencil/model/common.clj
+++ b/src/stencil/model/common.clj
@@ -23,5 +23,5 @@
       nil)))
 
 
-(defn unix-path [^File f]
+(defn unix-path ^String [^File f]
   (some-> f .toPath FileHelper/toUnixSeparatedString))