diff --git a/dub.json b/dub.json
index 96da85e..43fa0c4 100644
--- a/dub.json
+++ b/dub.json
@@ -45,6 +45,6 @@
     }
   ],
   "preGenerateCommands" : [
-    "rdmd $PACKAGE_DIR/dubhash.d"
+    "rdmd \"$PACKAGE_DIR/dubhash.d\""
   ]
 }