diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 0d312fa..b0a43bf 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -10,7 +10,7 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v2
       - name: Install devtools
-        run: Rscript -e install.packages("devtools")
+        run: Rscript -e 'install.packages("devtools")'
       - name: Install dependencies
         run: Rscript -e "devtools::install()"
       - name: Show session info