diff --git a/deploy.sh b/deploy.sh
index f9fbc91..cfa37a0 100644
--- a/deploy.sh
+++ b/deploy.sh
@@ -18,7 +18,8 @@ addToDrat(){
   git fetch upstream 2>err.txt
   git checkout master
 
-  Rscript -e "for(pkg in dir('..', pattern = ifelse(.Platform$OS.type == 'windows', '.zip', '.t*z')) { drat::insertPackage(paste0('../', pkg), \
+  Rscript -e "for(pkg in dir('..', pattern = ifelse(.Platform$OS.type == 'windows', '.zip', '.t*z'))) { \
+  drat::insertPackage(paste0(ifelse(.Platform$OS.type == 'windows', '..\\', '../', pkg)), \
   repodir = '.', \
   commit='Travis update ${APPVEYOR_PROJECT_NAME:-$PKG_REPO} build ${APPVEYOR_REPO_COMMIT:-$TRAVIS_COMMIT}', branch = 'master') }"