diff --git a/package.json b/package.json
index cf31b5880..41122487f 100644
--- a/package.json
+++ b/package.json
@@ -37,6 +37,9 @@
         "rimraf": "2.6.2",
         "shelljs": "0.8.1"
     },
+    "os": [
+        "win32"
+    ],
     "license": "BSD-3-Clause",
     "keywords": [
         "gpii",