diff --git a/entrypoint.sh b/entrypoint.sh
index 32bdfeb..649d3da 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -1,6 +1,8 @@
 #!/bin/bash
 
-cd functions; npm install
+FUNCTIONS_DIR=${FUNCTIONS_DIR:-functions}
+
+cd $FUNCTIONS_DIR; npm install
 
 if [ -z "${FIREBASE_TOKEN}" ]; then
     echo "FIREBASE_TOKEN is missing"
@@ -15,4 +17,4 @@ fi
 firebase deploy \
     -m "${GITHUB_REF} (${GITHUB_SHA})" \
     --project ${FIREBASE_PROJECT} \
-    --only functions
+    --only functions
\ No newline at end of file